Concepts inCharade: remote control of objects using free-hand gestures
remote control is a component of an electronics device, most commonly a television set, DVD player and home theater systems originally used for operating the television device wirelessly from a short line-of-sight distance. Remote control has continually evolved and advanced over recent years to include Bluetooth connectivity, motion sensor enabled capabilities and voice control. The main remote control technology used in the home is infrared.
more from Wikipedia