Features: Single Track. Portable behind-the-head wearing design, convenient for sports. Allow you answer or reject phone calls anytime and anywhere. Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN. Built-in lithium battery (charged via USB). Note: Compatible with

Features: Single Track. Portable behind-the-head wearing design, convenient for sports. Allow you answer or reject phone calls anytime and anywhere. Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN. Built-in lithium battery (charged via USB). Note: Compatible with most bluetooth enabled cellphones when used to answer or reject the phone calls but only compatible with Nokia devices of Symbian system when listen to music! Bluetooth adapter and VT BlueSoleil software are needed if you want to connect it to your computer for chatting on QQ, MSN