TOPSOUND

Infrared Cordless Stereo headphones for automotive FM system carrier frequency right channel 25.8MHz left channel 2.3MHZ ; Light weight headset for wearing comfort Auto muting design on receiving headphones Auto power-off volum control and on/off power switch; Speaker: 40mm mylay cone; impedance: 32Ω ; Effective range:about 10 meters ; Power source:batteries UM4*2(Optional); Batter life: about 40 hours; Weight :about 180g(batteries excluded); Auto Power-off( when no signals); Transmitter:Operating voltage 12v/20MA AC; DC adaptor(supplied) ;Dimension :approx 214(H)*90(W)*100(D)mm ;