<p>Adjustable leatherette padded headband and construction for comfort.</p> <p>Design for rear car entertainment (over-head video and headrest dvd), support Infrared wireless connection via IR transmitter ( battery needed,not included),dual channel and intuitive volume control for the setup.</p> <p>UNIVERSAL COMPATIBILITY - Compatible with for ,for ,for ,for ,for Escalade,for Uplander,for ,for Acadia,for Enclave,for Montana SV6,for Terraza,for Relay,for ,for ,for ,for and more car DVD players \/ aftermarket Headrest video player (DO NOT SUPPORT DIGITAL IR system and wireless playback for portable DVD players).</p> <p>You can use it to connect the car stereo or CD DVD players, for ,smartphones.</p> <p>Single channel</p> <p>Carrier frequency:</p> <p>A channel: 2.8MHz for right channel; 2.3MHz for left channel</p> <p>B channel: 3.8MHz for right channel; 3.2MHz for left channel</p> <p>Speaker: 30mm mylar</p> <p>Cone impedance: 32 ohm +\/- 15%</p> <p>Effective range (maximum): about 10 meters</p> <p>Power source: 1 x AAA battery is enough</p> <p>Automatically turn on when wear and turn off when take it off function</p> <p>S ratio: greater or equal to 70dB</p> <p>Channel separation: greater or equal to 40dB</p> <p>Frequency response: 30 ~ 20,000Hz</p> <p>Audio model: stereo</p> <p>Colour: black</p> <p>Material: ABS</p> <p>Package Contents:</p> <p>2 * IR wireless headphones</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>