Features: 1) Bluetooth protocol: version 1.2 2) 2.4GHz wireless Bluetooth frequency 3) Bluetooth range: 10 meters 4) Using the hands free Bluetooth profile, it is compatible with audio gateway (in/out) for all Bluetooth enabled PCs, PDAs, and cell phones 5) Crystal clear sound quality and weighs only 16g (approx.) 6) Voice-dial functions with mute button 7) Li-Ion battery power ensures more than 3.5 hours speaking and 120 hours standby time 8) Four kinds of covers: green, blue, black, gray 9) Dimensions (L x W x H): 63 x 28 x 10.5mm Outer packing: Color box