The lightweight RS 135 lets you enjoy freedom of movement without cumbersome cables. The headphones come complete with an easy-to-use recharging system. After use, simply place the headphones onto their convenient transmitter base station and they will automatically recharge for the next use. It's easy to set them up too! Just plug the transmitter in, and connect the audio cable to an analog output (RCA or headphone plug), it's that simple. The transmitter also features a convenient automatic on/off circuit: when you activate your audio source, the transmitter powers on without switches or buttons - easy! Some times after your turn off your audio source, the transmitter shuts off to conserve power. The three position channel selector allows you to choose an interference-free channel for clear reception - even through walls and ceilings. Product Type: Wireless headphone system - wireless - radio Recommended Use: TV, home audio Headphones Form Factor: Full size Connectivity Technology: Wireless - radio Headphones Technology: Dynamic Radio Frequency Range: 926.15 - 927.55MHz Sound Output Mode: Stereo Audio Specifications: Frequency Response 22 - 19500 Hz - Sensitivity 106 dB Impedance: 24 Ohm Controls: Volume, on/off Manufacturer Warranty: 2 years warranty Product Type: Wireless headphone system - radio Recommended Use: TV, home audio Headphones Form Factor: Circumaural Headphones Cup Type: Open Headphones Technology: Dynamic Connectivity Technology: Wireless - radio Sound Output Mode: Stereo Frequency Response: 22 - 19500 Hz Total Harmonic Distortion (THD): 0.7% Sensitivity: 106 dB Impedance: 24 Ohm Controls: Volume, on/off Radio Frequency Range: 926.15 - 927.55MHz Modulation Type: FM Transmission Range: 328 ft Connector Type: Audio line-in ( mini-phone stereo 3.5 mm ) Cables Included: Audio cable Included Accessories: Transmitter unit, 3.5 mm to RCAx2 adapter, 3.5 mm to 6.3 mm adapter Battery: 2 x battery - AAA type - rechargeable - nickel metal hydride Included Qty: 2 Run Time (Up To): 20 hour(s) Service & Support: Limited warranty - parts and labor - 2 years