Slashdot Mirror
Electrolux Robot Vacuum Cleaner
An anonymous reader writes "Modelled on an ancient arthropod the Electrolux Trilobite is in stores from Friday and should cost around £999." It isn't the first robot vacuum, but they do claim it automatically recharges itself (which I don't think the Roomba does). And for only 8 times the price! A bargain. Electrolux's website has some more information.
I've heard these things kinda suck...
!ERR: Signature not found.
Remember this quote from the article:
... when they turn against us.
Magnetic strips must be placed at doorways and near stairs to act as invisible walls and stop it plunging to its doom down a flight of steps.
What's this "vacuuming" technology you speak of?
I seem to recall reading this somewhere... oh here ooops :-)
On another note I got to watch one of these do there thing a while back, and while the concept seems cool they tend to bump into feet a litle too much. It's like a dog trying to hump your leg
This is not a sig
Worse than Garfield on shopping day!
This must be news about the US release.They (Trilobite) have been available in Europe and Sweden for two years. Very new(s) indeed.
Nothing sucks like an electrolux!
Toronto-area transit rider? Rate your ride.
For that amount of money, you are a sucker if you buy one!
of Zorg's Office, in "the 5th element" :)
do this robot also tap one's back, when he's coughing because of the flying dust ?
Trolling using another account since 2005.
Roomba has an add-on self charger. Around $50 if I remember, at Bed Bath & Beyond (or was it Linen's and Things? they look identicle to me when I get inside the door).
Eve Fairbanks says I drive a hybrid!LOL
Seriously ... this is cool!
Electrolux are a huge mainstream consumer goods company so that they have the balls to develop and market this is fantastic and it will spur others on, which will reduce costs and expand the market.
I'm 31 - when I was a child they promised us a life cast free from housework with more time for leisure.
While it's always been tantalisingly close, most products have been out of the reach of the general consumer, or produced by esoteric manufacturers that are not household names.
Now they are actually starting to deliver. I salut you, Electrolux!
"The Trilobite® is the world's first automatic vacuum cleaner." As usual, Electrolux is using falsehood in advertising. There are older robosweepers than this one. When I was in college in 1989, I thought trying to sell Elecrolux sweepers would be a good paying job to help get me through. Not only did the damn things cost nearly $2000 dollars, but all their "exclusive features" were duplicated by other brands. The only people willing to buy a $2000 sweeper had to apply for credit, and were always turned down. I had to go back to delivering pizzas as that "job" for straight commissions only cost me money. Any product hawked by door-to-door salesman is crap.
The Uncoveror: It's the real news.
Now, if it will just bring me a beer, I could get rid of my girlfriend! It may be 8x more expensive than the Roomba, but that's nothing compared to how much she costs me!
Five Dolla Moddy-Moddy?
The way you normally use the Roomba is you set the room up so the Roomba can't escape, and you let it go. It does the room, and then chirps when it's done (or stuck). If you don't lock the roomba into the room, it'll wander the whole house but not really get anything done since one charge (of either machine) is really only enough battery to do one room.
To automatically recharge, the charger would need to be in the same room as the vacuum cleaner. If you have two floors, or you have doors, steps, or other obstacles, I imagine that part of it wouldn't work so well - you'd have to keep hauling the charger around as well as the vacuum.
Also unless the AI is good enough that the thing really can navigate itself around a changing environment (hey there wasn't a dog there last time) and make it's way back to the charger before dying every time, I imagine you'd find a dead Trilobyte fairly frequently.
The Roomba normaly takes 12 hours to charge, but if you get the fast charger, it charges in an hour and a half. The fast charger is $69, but well worth it.
And if you buy it from http://www.hammacher.com, they give you a lifetime warranty! I'm wondering if they're going to regret that someday..
So unless this thing shows some other serious advantage over the Roomba, I can't see how it justifies the price..
And I'm not sure how they can say "While other firms have shown off prototype robot cleaners, Electrolux is the first to put one into production.", the Roomba has been on the market for a while now.
- Steve
Of course, being circular it can't vacuum corners, so you'll have to buy a seperate vac and do that bit yourself. What a fantastic design.
Does it make R2D2 noises?
"I'd rather have a full bottle in front of me than a full frontal lobotomy"
It's a nice idea, but when you get home after a long day at work beating the robotic vacuum doesn't have the same appeal as beating a real-live wife.
yeah I'm joking
Trolling is a art,
Do stairs? Put itself away when it's done? For a grand, it better empty itself in the trash bin, too!
This should make for a killer vacuum solo.
Give me Classic Slashdot or give me death!
NVidia will use these vacuum cleaners for their Geforce FX2.
this sucker looks a hell of a lot like the roomba, as stated in the post. we sell (or tried to sell) the roombas where I work for $199.99, and they sold like crapcakes. Nada. People want a vacuum that can hold more than a handful of dust.
I daresay this version will have the same problems owing largely to its short profile. no room! now, if part of the auto-charge trip included an auto-discharge (of waste tray contents) then I think more people might consider dropping that kind of money.
just my 19,999 cents. [tax not included]
el cobardo anonimo
Is that yet-another-box-with-recorded-human-voice-which-sa is-"Hello"-and-impresses-morons?
Cos if it is, this is not news for nerds.
It does not have AI and it definitelly is not a real "robot".
Vaccuuming is a great exercise. For us fat, lazy computer geeks, we can actually benefit from doing it.
100% Insightful
Seriously, this is something every guy wants and needs! Besides, I have promised my better half that when we are living together, I will take care of the vacuuming ;).
Lesbian Nazi Hookers Abducted by UFOs and Forced Into Weight Loss Programs - -all next week on Town Talk.
It's their only product that doesn't suck.
Thank you. I'll be here all week.
I've used mine perhaps 20 times since I bought it, and it has a lot of problems now. Sometimes it just stops in the middle of the room and beeps its "I'm stuck" sound, even though its not. The battery has basically died to where it might run ten minutes on a full charge.
Its an interesting device, but I've not been terribly happy about how its aged in the six months I've had it...
Rectangular rooms. Result: dirty corners.
--- Ban humanity.
I would like to see how this can deal with my stairs!! And what if I leave the charging unit down stairs while ol' trill is cleaning up - upstairs.
"I love deadlines. I like the whooshing sound they make as they fly by."
I can see how this might be useful in large open-plan areas (offices etc.). For that you would need an auto-emptying dust box though.
For a normal-sized home though, I'd have thought the setup time - setting the thing going, laying the magnetic strips, emptying the (presumably small) dust box and kicking it when it gets stuck - would be similar to the amount of time it would take to vacuum the place yourself.
I've used mine perhaps 20 times since I bought it, and it has a lot of problems now. Sometimes it just stops in the middle of the room and beeps its "I'm stuck" sound, even though its not.
Have you also cleared the brushes 20 times? I didn't think so. You're supposed to do that after every run. Wrapped up hair can provide enough friction that it thinks it's stuck.
the CEO of Electrolux (Michael Trechov) visited my engineering school in Sweden and told us about this new cool product - the robot vacuum cleaner. He was using a prototype at home.
I wonder what took them so long to go to market...
Tor
. . . they built on top of rat brain cells? Like a rat, does it crawl into the walls to dump it's load of dust and dirt?
An airplane ticket to your choice fo destination in Europe.
Oh hold on, was that for another brand ?
michael, we all realize that you can't post an article without a douchebag comment. And we shouldnt feed trolls such as yourself, but re: your "for only 8 times the price" quip.
The difference between an Electrolux and Roomba:
Roomba is a novelty. I've seen one in action, and it's absolutely useless. A dustbuster on a windup toy car would be more effective.
Electrolux makes good vaccuums, arguably the best. Their product will work. Roomba doesnt.
So you either want a toy, or a vaccuum.
I don't need no instructions to know how to rock!!!!
If you had a robotic carpet, you would never have to worry about having to vacuum. All you would have to do is turn it on for a few seconds and the whole thing would be clean. You could also get rid of the deepest dirt. If you reverse the flow you could also play air hockey on your carpet. How awesome would that be?
Besides, the only reason I would want one is if i could control it from work via internet and have it chase around the cats. (that would be great)
"Mr. President, we cannot allow a mineshaft gap!"
Roomba Wars A photos-with-captions story of a guy, his girlfriend, and their Roomba - pretty funny stuff.
We've had our Trilobite for over a year now (as said elsewhere, it's been out for a few years in Northern Europe) and love it.
It has a set of silly soundeffects it probably generates with a monophonic chip, a bit like old cellphones. The sounds have intentionally been made robot- like, but they also differ from each other so that you learn to distinguish them, and know what they mean.
Also, when it's measuring the room or looking for the charging station, the sonar crackles in a robo-cool way.
So R2-D2 sounds? Yeah, kinda.
It's an interesting little critter. Unlike with some toys, with which you're supposed to interface for entertainment, this thing is going around doing its own business, not craving any human attention (except for when the bag gets full).
This utilitarian nature of it feels spooky in a cool way, it is very much a robot and very much a household member.
J
this one can see stairs by itself without magnetic strips it also recharges itself, empty its dustbag and remembers where it has been ....
[the link is dutch and french only]
http://www.robocleaner.be/
"Seriously, this is something every guy wants and needs! " Actually BlowJobs are what every guy wants and needs. Get a life and get hardwood floors. You can clean them by walking around your house in socks.
...will it evolve?
http://games.slashdot.org/article.pl?sid=03/05/16/ 1232250&mode=thread&tid=127&tid=186
But they sell anyway, because they fill an important vacuum in the product line.
Would it be possible to create a sub-classification at Slashdot to cover press releases like this? Sure, it's a link to an article about this product, but products like these things have been out a couple years now, so this is hardly news.
Mod me a troll if you want, but this is an ad for a freaking two year old vaccuum, people. When did Ron Popeil become an editor here?
Mmmm...lazy. *drools*
Check out its stunning personality here. It bleeps, bloops, and whines while cleaning, which makes it about fifty times as personable as I am while I'm doing my chores.
This promotional site has been up for quite some time, so I had no idea it would take so long to get the Trilobite to market. Personally, I'd prefer a cuttlefish-like robot that swims around my sink and cleans my dishes while blub-blub-blubbing.
< He isn't gay like you! >
-------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
The cow is brought to you by the Open Trolls Movement (tm)
Dyson (of the uk) have had a vacuuming robot for a while now, and it uses supersonic air cyclones rather than bags to separate dust and air so that no suction is lost as the thing sucks up more dust..
you can see it here
Three maybe.
I think it would require that you can see the floor from junk, so I guess that I can't use it.
my sig
so I can call it "ElectroTux!"
. . . No, that would suck.
The funnier the slashdot moderators find me, the more my friends and family think I have lost my mind. Perhaps slashdot is a government tool to preoccupy the insane?
Sdelat' Ameriku velikoy Snova!
It is not intended to completely replace manual vacuuming.
It only does the easy parts for you, vacuuming the more difficult-to-reach places (corners, under furniture, stairs) is what takes the most time and effort when cleaning...
Since I'm lazy, I've skipped vacuuming under the couch for a couple of months...and I fear what I'll see next time I move it.
One of these would probably make me even more lazy...
I heard a lecture from the CEO of Electrolux when this was in development five years ago, this is what he told us.
You are absolutely right about the reaching corners part. But apparently, they had done tests with people vacuuming and found that most people miss patches here and there. Thus while the robot does miss corners, it has slightly higher covering percentage overall.
Tor
I can clean a 4 meter by 4 meter room in 3 minutes with a manual vac. Why spend 3 minutes fiddling with the entrails of a robot vac?
Sure, the robot vac is 'k3wl3r' and scares the cat, but it doesn't sound like it results in 'less work'
Sorry, too hard on the asthma, bad back and crapped out lower appendages. The latter being the result of trying to do sports in order to help stave off the former.
Much rather limp along the seashore sidewalk. Nice scenery, fresh breathable air with lots of oxygen, and lots of benches. No need to fear the UV if you dress up like a Berber - or a particularly photophobic vampire.
Meanwhile, until it can hang from the roof and learn not to vacuum up the couple of miles of cable and wire laying about my palatial 2room apt., not to mention CDs, books, unselected attire &c., that priviledge shall go to the unfortunate human I can hardly afford to pay for.
A machine that could cope with that would be probably be smarter than me, anyway. No, thanks. Too much like a "Wonderful Life" cartoon.
SSSLAAAAAAAAAAASH----DOT!
If you're not on somebody's shit list, you're not doing anything worthwhile.....
Move to a round house.
Or, for just 99,99 each, you, yes You!, can get these wonderful exclusive and exciting self-vacuum-adhesive room-corner-rounders ! Call now ! Limited stock !
Buy five and the extra glue is FREE !
From the article:
Seems to me that bumping into animals become less of a problem when said animals are running like hell to escape the high-frequency sound...
Don't know what frequencies it operates at, or if that could be a problem.
Are you a grammar Nazi? I'm trying to improve my English; please correct my errors!
The electrolux needs to be "told" where stairs are, while the Roomba has sensors to avoid plunging down a stairwell.
However, the way the electrolux figures out a room sounds a little better than the Roomba...
My question is - surely people are doing home versions of these? After watching the Roomba in action for a while in my own house I think I could come up with some better cleaning algorithms.
Some thing I'd like see in a robo vacuum:
1) Sturdier treads so it can over over tricky obstacles (like chair legs)
2) "Under Bed" mode where you can stick it under a bed and it only vacuums when there's an obstacle above it.
3) HEPA filters so the thing's not spreading dust everywhere.
4) Large memory to remember complex spaces.
5) Surface detection to do different sorts of cleaning on different surfaces.
"There is more worth loving than we have strength to love." - Brian Jay Stanley
Being lazy is a good trait, as it tends to lead to greater efficiency. I spend hours trying to work out how I can either a) get away with doing as little actual coding as possible or b) Blame someone else.
You can't win Darth. If you mod me down, I shall become more powerful than you could possibly imagine
Here are some images of the device:
Trilobite Images
--
Dreamweaver Templates
The Electrolux Trilobite has been available in Sweden since 2001. Last year 15000 units were manufactured. For swedish-speaking readers, a page about the Trilobite is available at Svensk Industridesign. It's also a bit cheaper in Sweden, at 11869 SEK (about £920, 1300 euros or $1500). For once, models are tested in Sweden. Even Ericsson hasn't been doing that for quite a while...
-- Free speech is only free if your time is worth nothing.
a beowolf cluster of these!
All your base are belong to us!
I wonder if I can sue the company if my cat needs therapy after a few weeks of this robot zooming around my floor.
For cat-chasing from your desk at work, I suggest getting one of the little plantraco rovers, the internet control kit, and the wireless camera. Use webcam software and a cheap winTV vid cap card to stream video of what the rover "sees," and use the internet-connected controller to drive it around. They even have a demo of it where you can drive a rover at there office from your web browser here.
Until a vacum cleaner can move furniture around like chairs and tables, what is the point? It will miss many places as it bounces off obstacles. Only a human (in this day and age) can move a chair temporarly, vacum and then put it back.
Robot vacums will become mainstream when designer will allow them to be used as normal vacum cleaner. I do not want 2 vacum cleaners, only one. It could let it go automatically once in a while to clean the large surfaces, and at every 1 or 2 weeks, I would vacum thouroughly the house, using the same apparatus, manually (moving furniture around). And the price of such vacum cleaner must not be much more expensive than does of todays vacum cleaners.
Until then, I do not think I will buy one, nor most people. This said, there might be a market for such a product, if targeted for yuppies for instance.
Remember the year 2000? They promised us flying cars. They delivered the PT Cruiser...
I checked out the Trilobite in the shop a few months ago, and the first thing that struck me was the noise. You don't want to stay in the same room while it is doing it's thing...
lifetime warranties do work. totes umbrellas have a lifetime warranty. i had one that broke in half, sent it in with $3 for shipping and got a brand new replacement. total cost was less than buying a really crappy umbrella from a street vendor.
when religion is no longer the opiate of the masses, governments will resort to real opiates.
Until the market really clamors for it it is still just some engineer's pipe dream.
The thing to note, these engineers apparently had the bucks to get it done.
Perhaps the real benefit is to make people think of new and more useful ways to employ robotic help around the house.
* Winners compare their achievements to their goals, losers compare theirs to that of others.
Secondly, it should digest and live off the dust, which is mainly human skin, so rich in protein. I'm thinking a small bacterial engine that can turn dust into glucose, and pass that onto a glucose fuel cell of some kind.
Thirdly, should be really cheap. I don't want to have to take out my credit card each time I step on the cleaner by mistake. I'm thinking that the ideal model would actually be organic, which makes sense, given the bacterial engine, and so it could actually breed. Hey, why not?
Forthly, I want a powerful AI engine that can avoid stairs and feet, and will search for dust where it's most prevelant, namely in corners and in those hard-to-reach areas.
Fifthly, why not make it able to walk up walls... perhaps using those little sticky feet that pickup the dust so well.
Lastly, since the model is small, it should package its collected dust (after bacterial digestion) into easy-to-sweep nodules. This will eliminate any need for dust bags, discharging stations, etc.
Reviewing my design against the available models, I think the most practical solution would be to use standard breeding techniques combined with genetic engineering to create a species of super cockroaches that live off dust. There may be a small market acceptance problem, but I believe this can be overcome by finding a new name and a cute logo... how about "RoboRoach"?
Sig for sale or rent. One previous user. Inquire within.
Anyway, October 2002 I showed the Trilobite actually working in a stylish living-room type setting, actually a lounge area we set up in the Swedish Embassy in Tokyo for a few weeks of events. Electrolux was a sponsor. It was made almost entirely by Electrolux, with some changes for the Japanese market provided by Toshiba (mainly electrical and marketing I believe).
Here is a page in Japanese showing the Trilobite on sale for 268,000 yen. Not cheap for sure.
The unit is astounding when you try it, it navigates around table legs and goes under sofas, and starts up and shuts down by itself (and docks itself too). One of the areas they wanted to improve was to make it quieter so that may have been done already. (the Japanese page says 65dB) It is kind of like an Aibo that actually does work for you. It also walks around you, not the other way around.
It's not necessary to clean the brushes every run. According to this page, they recommend doing it every ten runs. Although I think most people could go with, "As needed." Picking up a lot of long hairs? You'll probably need to clean more often. Not much hair? You can probably do it less frequently. Just clean it when a big wad of hair accumulates at the ends of the brushes.
The Trill is far more advanced than the Roomba -- it uses ultrasound to detect the layout of the room. The Roomba keeps moving until it hits something. That would probably explain the price disparity.
These where available in germany for some time. .... LOUD!
I one got to try one in a shop and the pirmary impression was
Shoelaces, throw rugs, towels, and TP,
Cat barf, hairballs, remote for the TV,
Appliance power cords strewn all about,
Trilobyte sucks 'em all right up it's snout.
The Russians have won. They have made the world a cesspool of distrust, greed, fear and hate.
any relation to Miles Dyson?
these things are the bomb. Wet and dry alike, it cleans everything up (25 gallons worth!!). The Shop-Vac could probably vacuum up some of these robots.
sulli
RTFJ.
Of this post being moderated funny:
4 80 053
http://slashdot.org/comments.pl?sid=42669&cid=4
http://www.three.co.uk/
Government of the people, by corporate executives, for corporate profits.
A search on the word "door" through the postings so far would seem to say that nobody on all Slashdot has mentioned that the robot vacuum was the primary invention of the protagonist in Heinlein's "Door Into Summer".
Actually, that guy's "Hired Girl" product would clean any floor, switching from vacuuming to floor polishing to mopping:
"I swiped the basic prowl pattern from the 'Electric Turtles' written up in Scientific American in the late forties, lifted a memory circuit out of the brain of a guided missile (that's the nice thing about top-secret gimmicks; they don't get patented), and I took the cleaning devices and linkages out of a dozen things..."
The year of this accomplishment was about 1970, so the prediction was for about 14 years after the book's writing in 1956. The book's plot has the betrayed and ruined inventor fleeing his troubles via suspended animation that takes him to the vastly more advanced year of 2000.
Alas, the real 2003 doesn't have half the things he (fictionally) predicted for 1970.
mood indicator light did you say? let me guess, when its happy, it glows a nice amber?
Hmmm... Sounds like "Choose Your Own Adventure" to me. Heh.
1. Bash Microsoft
2. ???????
3. KARMA!
Since it has sensors to avoid running into things, if your dog attacks it will it run away? :) It might make a good playmate for your bored dog while you're at work :)
until they come out with the "Lewinsky" model.
I'm such a sexist :-)
Ideal autonomous vacuum cleaner
Funny this topic came up; I just purchased a Roomba last night at Target for $199.99. It charged all night and as I type it is making it's way around my hallway. It doesn't seem to all too efficient, but hey, my carpet still gets cleaned without me having to worry about it, and not to mention the barel of laughs I get when the vaccuum suddenly turns directions and heads for one of my two cats! This stuff is a long way off from being anywhere near perfect. I don't think I'm going to keep the Roomba, but at least it was amusing for awhile!
Wherever you go, there you are.
We had one in the 'house of the future' as part of the IEE's Faraday Lecture. I was a presenter of this lecture and had to make this thing work on stage in front of 1500 people. All I can say is that it's the most unpredictable gadgets ever, it never did what it was meant to do. The battery life is pants, it hardly holds any 'dust'.
It almost fell off the stage during one show...
http://www.iee.org/Events/Lectrs/Faraday/2001/
Just yesterday in the NZ Herald newspaper here in New Zealand there was an article / "review" of Rosie, the Karchner RC 3000 robotic vacuum cleaner (NZ$2995, ~US$1710).
... rich toys for the terminally lazy (and disgustingly dirty!) ;o)
Yet another useless flat, round robotic vacuum cleaner that doesn't get into the corners, but it at least doesn't fall down the stairs (no need for you to put magnetic strips down!) and does re-charge / empty itself (assuming it doesn't get "stuck" or roam too far from the recharge station).
Ahh
-- recharges as long as you remember to plug the critter in. I can leave it running in my wee home/office [4 meters x 4 meters] and wander back 10 or 15 minutes later and it's all done vacuuming. Turns itself off. Amazing how quiet my computers run without dog hair in the fans.
It seems to stop wherever it started though I can't vouch for that, every time. My wife had a 20% off coupon at some store when she bought it a few weeks ago -- for $160 after discount.
My wife has MS, (Multiple Sclerosis, not MicroSoft) and she's a neat freek. As a side effect of MS, she get exhausted a lot easier than normal. So, even if this isn't a time saver, the amount of effort using this has to be a lot less then pushing a vacuum around. So far, this sounds like the first step in a pretty good thing!
For some unexplicable reason, I have the urge to wait until I can get a robotic Kirby instead.
Stairs?
http://www.matrix4.net details info about robots that are smarter than humans! :)
check it out
peace!
My Roomba self-charges - All I have to do is plug it in the wall. Its not like I have to turn a crank for eight hours.
http://www.littermaid.com/ http://shop.store.yahoo.com/pet-guys/-723503500020 .html
http://www.hdw-inc.com/clevercat.htm
http://www.petdiscounters.com/cat/litter/op_box.ht ml
http://www.petdiscounters.com/cat/litter/
http://www.lovemypet.com.au/cats/litterboxs.htm
-- it must be true, it's on the internet.
http://www.littermaid.com/ Probably scare the cat too.
0 .html
t ml
http://shop.store.yahoo.com/pet-guys/-72350350002
http://www.hdw-inc.com/clevercat.htm I like these best
http://www.petdiscounters.com/cat/litter/op_box.h
http://www.petdiscounters.com/cat/litter/
http://www.lovemypet.com.au/cats/litterboxs.htm
I don't actually own a cat but I have looked after a few while their owners were on holidays. Their mess is nothing compared to the mess a horse can make.
-- it must be true, it's on the internet.
I find if you empty the tray at least daily then cat didn't get messy paws although she did still scatter gravel around the laundry tiles. I actually preferred a kitty litter sieve thing vaguely equivalent to a mucking out rake ie it picks up lumps but lets the litter/sawdust through). So empty lumps out daily and change litter weekly or more often if too soggy/wet.
The other thing I have heard frequently recommended is when you have more than one cat you need n + 1 cat trays where n is the number of cats that you have. For example 2 cats, need 3 trays. And you'd have to empty all of them daily.
and something else I didn't expect when visiting a friend was they used torn up paper or shredded paper for kitty litter. Cheap and can be recycled through the garden compost if you have a backyard or a worm farm. This stuff would require daily changing as it doesn't lend itself to sieving.
I just wish there was some way to stop cats from eating native wildlife and stick to the imported feral rats and mice. Some cats don't mind being confined to the indoors but my former housemate's cat used to get the most diabolical pungent diarrhoea when confined. And the native wildlife (possums) used to beat it to a pussy semi-conscious mess if we let it out. Eventually it went to live on the family farm.
Maybe a large carpet square or doormat might help with the paw cleaning?
-- it must be true, it's on the internet.