1) bluetooth two channel stereo wireless receiver, the effective range is 10 meters 2) supporting Bluetooth profile :Serial Port,Bluetooth equipment ,Headset,Mobile phone,Transfer,Network Access,stereo Audio,etc 3) chatting on line with Skype function 4) supporting various audio facilities with USB audio output jack 5) connecting with HIFI earphone,sound clear 6) special chip, high receiving sensitivity 7) automatic consumption decrease design, low power consumption, long using time 8) the transmitter is powered by USB directly, no need battery 9) in-built a chargerable Lithium Polymer inside the receiver, USB modular charging, convenient and simple 10) noise-cancelling technology