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Sennheiser RS 120-8 II Wireless Headphones Enjoy wireless freedom and high-fidelity stereo sound with the lightweight Sennheiser RS 120-8 II headphones. Ideal for video conferencing and multimedia, these headphones offer up to 328 feet of reception through walls and ceilings, ensuring uninterrupted audio performance. Key Features Wireless stereo sound with reception through walls and ceilings up to 328 feet Simple built-in recharging system with convenient transmitter base station Detailed, warm sound reproduction with strong bass response Open-Aire design for hi-fidelity audio reproduction Volume, on/off, and tuning controls located on the headphones Lightweight and comfortable for extended wear Replaceable earpads for long service life Charging stand doubles as headphone storage when not in use Wall-mountable transmitter with automatic on/off circuit Supports multiple headphones receiving RF signal from one transmitter (use HDR 120) Includes transmitter, power cable, audio cable, and headphones Compatible with RCA jacks (red and white outputs), 1/8" and 1/4" headphone sockets (including laptops and desktop computers) Three selectable transmit channels to avoid interference or use multiple transmitters in one room Includes two AAA NiMH rechargeable batteries 2-year warranty Compatible with set-top DVD & Blu-Ray players, DVRs, satellite receivers, A/V receivers, laptops, Mac/PC, MP3 players, LCD, Plasma, and standard televisions with RCA or headphone outputs What's in the Box? HDR 120 headphone TR 120 transmitter (audio cable attached) Transmitter power cable Two AAA NiMH rechargeable batteries RCA to 1/8" audio adapter 1/8" to 1/4" audio adapter Instructions for use Specifications Colour: Silver Impedance: 24 Ω Dimensions: 85 x 225 x 133 mm Connector: 3.5 mm / 6.35 mm stereo jack Frequency response: 22 - 19,500 Hz Total harmonic distortion (THD): Ear coupling: Supraaural Transducer principle: Open, Dynamic Weight: Receiver: 230 g (including batteries), Transmitter: 200 g Power consumption: Signal-to-noise ratio: > 65 dBA Operating time: 20 hours Modulation: FM stereo Power supply: Receiver: 2 AAA rechargeable cells, Transmitter: 9V block SPL for peak deviation: 106 dB