*1.Transmitting medium: Infrared (850nm)
*2.Signal to noise：above 60 db;Impedance:32Ω±15%
*3.Transmitting mode: stereo
*4.Frequency response: 30Hz~20 kHz
*5.Headphone power:AAA1.5V*2
*6.Carrier Frequency:R:2.3MHZ;L:2.8MHZ
*7.Headset current consumption: less than 20MA
*8.Receive Distance:About 8M