wireless earphone,IR Dual Channel,2.4G USB,WIRELES

wireless earphone,IR Dual Channel,2.4G USB,WIRELESS SPEARKER,2.4G UHF Wireless Headphone,Noise Cancelling Headphone Advanced wireless and digital technologies provides stereo hi-fidelity CD-quality without wire; PC with USB audio streaming capability through USB port, windows 2000/XP/Vista/Win 7.0 is available; Microphone function is also available for USB application; Talk freely through SKYPE, MSN, Yahoo or QQ, etc. Devices with audio out connectors like TV, iPod, MP3, MP4, CD player, etc.can also be the music source of the headset.(USB transmitter base paid extra is needed for this function); When fully charged, the built-in rechargeable battery can support about 8 hours operation time; 1) Frequency Carrier: 2,4GHz 2) Reception range: 10m 360° 3) Transmit power: 4dBm 4) Frequency response: 20- 20000Hz 5) S/N ratio: >80dB 6) Distortion: <0.1% 7) Working Power: 3.5-4.2V 8) Speaker size: 30mm mylar 9) Working time: 8 hours 10) Headset size: 65*105*145mm 11) Headset N.W.: 20g