2.4G Hi-Fi Small Wireless Stereo Headphone 1,Built-in Lithium Battery 2,2.4G USB transmitting 3,Hi-Fi stereo sound 4,CE ROHS 2.4G Hi-Fi Small Wireless Stereo Headphone1,Built-in Lithium Battery2,2.4G USB transmitting3,Hi-Fi stereo sound 4,12 hours working time 5,morethan 20 meters transmitting distance Pictures: