1)System:Infrared light(850 nm)2)Carrier frequency: Left channel: 2.3MHz right channel: 2.8MHz3)Modulation:FM4)Model:stereo5)S/N rate:> 75dB6)Channle Speration:> 50dB7)Distortion:<1%8)Frequency response: 30 - 20,000Hz 9)Transmitter power supply:DC12V, 150mA10)Headphones power supply:2 x AAA (rechargable battery is optional)