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Specification: 1, power supply:DC 2.2V-3.3V 2, working current :30mA + 5mA 3,receiving frequency: A chanel:L/2.3MHz,R/2.8MHz B chanel:L/3.2MHz,R/3.8MHz 4,receiving distance:≥ 6m 5,frequency response:20Hz-20KHz 6,power output:≥ 8mW 7,S/N ratio≥ 60dB Features: 1,Compatible with any audio device with IR transmitter built-in,especially for cars. 2,IR daul channel wireless headphone function. 3,Receive stereo crystal clear sound from audio devices wirelessly,without interference from other radio tracnsmission sources. 4,Before using, please install 2xAAA battery (not included) Note: When use this IR product,try to avoid being blocked by obstacles,receive IR audio signal within effective distance.Otherwise,some slight noise or mute may arise in the headphone,it belongs to normal phenomenon,for the signal may loss a lot when it's blocked by obstacles.