Remember the Sphero BB-8 Droid? It is a cute, app-enabled robot for Star Wars fans. Thanks to the Force Band, you can control the robot like a Jedi. It attaches to your wrist and lets you use simple gestures to pull, push, and drive your robot. Your BB-8 will follow you based on the motion of your arm and the direction your body moves.
The above video gives you a better idea how this wearable device works .