Get rid of those cables and go wireless yourself or share your music with up to four people with the Sennheiser RS 170 Wireless Headphones , complete with a multi-receiver transmission mode. Soft leatherette earpads and headband cushions that make these headphones emminently comfortable, even over prolonged use. The Sennheiser RS 170 Wireless Headphones come with a TX 170 transmitter and uncompressed audio transmission technology from Kleer, to make every song sound great! The Sennheiser RS 170 Wireless Headphones have dynamic transducer systems with powerful neodymium magnets, which reproduce sound in fantastic clear quality. They also have Dynamic Bass and Surround Sound listening modes to enhance your music experience. The multi-purpose transmitter that comes with this pair of headphones doubles as a docking station and an easy-charge cradle as well. The set-up process is easy - just plug and play, then lean back and enjoy your playlist with the Sennheiser RS 170 Wireless Headphones ! Characteristics Headphone Type Over-ear Headband Headphone Style Travel Colour Black Foldable No Adjustable No Acoustic System Closed Jack Type & Style 3.5 / 6.3mm adapter Weight Approx. 228 g (without batteries) Wireless Yes Bluetooth/Wireless Range Approx. 80 m in the open area Frequency Response 18 - 21000 Hz Impedance 32 Ohms Sensitivity 110 dB Requires Batteries 2 NiMH-Akkus Typ AAA, 1,2 V, 600 mAh Other Features Has a transmitter and charging station for your wireless use. Features leatherette earpads and headband cushions.