Sennheiser RS 130 Wireless Surround Sound Headphones (Discontinued by Manufacturer) Includes Rechargable NiMH batteries, charging stand, transmitter, and 1/4-inch plug adapter Lightweight, comfortable design; 22 hours average battery life per charge Intelligent auto tuning and automatic signal control ensure high-quality reception Wireless, rechargeable hi-fi headphones with SRS surround sound mode Transmission range of up to 150 meters; 18 Hz to 21 kHz frequency response 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 Includes Rechargable NiMH batteries, charging stand, transmitter, and 1/4-inch plug adapter