I had posted about a gesture based wearable tech Ring in the past, and it seems like someone else also had a similar idea. Nod gesture control ring is designed to use your hand movements and translate them into commands, allowing you to control devices and applications. Upon watching the video, I can tell you already that I want one. For what reason you ask? So that I don't have to scroll though each letter when typing my username and password for applications like Netflix or Hulu. It also kind of reminds me of Minority Report.
Some of the specs for the $150 ring include an accelerometer, gyroscope, compass and temperature sensor, responsive to capacitive touch, 24 hour battery life, it's waterproof and comes in 12 sizes.