The RS 180 wireless headphones from Sennheiser allow you to enjoy full uncompressed CD-quality audio without the hassles of wires. The system includes a pair of around-ear headphones and a base station transmitter that lets you enjoy your audio. The transmitter connects to your CD player, computer, home theater, or other audio devices. It uses KLEER wireless technology to send uncompressed digital audio up to 320' to the headphones. KLEER technology provides automatic, interference-free pairing between the transmitter and the headphones, so there's no need for tuning. The transmitter also acts as a dock and charging station for the headphones.