Adjustable leatherette padded headband and construction for comfort. 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. 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). You can use it to connect the car stereo or CD DVD players, for ,smartphones. Single channel Carrier frequency: A channel: 2.8MHz for right channel; 2.3MHz for left channel B channel: 3.8MHz for right channel; 3.2MHz for left channel Speaker: 30mm mylar Cone impedance: 32 ohm +/- 15% Effective range (maximum): about 10 meters Power source: 1 x AAA battery is enough Automatically turn on when wear and turn off when take it off function S ratio: greater or equal to 70dB Channel separation: greater or equal to 40dB Frequency response: 30 ~ 20,000Hz Audio model: stereo Colour: black Material: ABS Package Contents: 2 * IR wireless headphones Only the above package content, other products are not included. 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.