Turn up the volume without disturbing a soul! Don’t let noisy TV bother others... and don’t let others who are making a racket ruin your favorite show! Just plug the transmitter into TV, radio, iPod or MP3 player, CD/DVD player or other audio equipment. Wireless headphone will receive sounds up to 100 feet away. Adjustable earphones have cushioned ear pads, volume control, scan, reset, and on/off buttons. Two-piece unit uses 4 AAA batteries overall (not incl.).