The X5 Stereo Bluetooth Headset is a portable multi-function device utilizing the latest cutting edge technologies allowing you to stream high quality music and make voice calls using a mobile phone, pda, or computer - without wires attached to the headset. With features like a removable rechargeable battery that lasts for more than 12 hours, A2DP technology for true surround sound and a detachable microphone the BlueAnt X5 Stereo Bluetooth headset is impressive.