Smartwatches Can Be Used To Spy On Your Card's PIN Code (softpedia.com)
An anonymous reader writes: A researcher has developed a smartwatch app that can interpret hand motions and translate the movements to specific keystrokes on 12-key keypads, like the ones used at ATMs. The app sends the data to a nearby smartphone, which then relays it to a server, for analysis. The whole AI algorithm on which it's built has a 73% accuracy for touchlogging events, and 59% for keylogging. The entire code is on GitHub, along with his research paper, and a YouTube video.
Most people wear watches on their off hand, so it won't be a problem.