Listen to your favorite music wirelessly from up to 330' away with the black RS 135 Wireless Stereo Headphone System from Sennheiser. The RS 135 is an open, supra-aural wireless (900 MHz) RF headphone system that is designed to produce well-balanced sound with enhanced bass response from all types of music and TV applications. It features volume and tuning controls on the device itself. Additionally, the RS 135's "easy recharge" function on its transmitter base enables you to charge the headset while it's being stored.