Sennheiser Remanufactured RS-130 Wireless Surround-Sound Headphones (Discontinued by Manufacturer) Wireless, rechargeable hi-fi headphones with SRS surround sound mode Intelligent auto tuning and automatic signal control ensure high-quality reception Transmission range of up to 150 meters; 18 Hz to 21 kHz frequency response Lightweight, comfortable design; 22 hours average battery life per charge Remanufactured to like-new condition; 2-year manufacturer's warranty