Sony DRBT101/WQ Over-the-Head Style Stereo Bluetooth Headset (Discontinued by Manufacturer) Over-The-Head Design Built-In Subtle Microphone For Compatible Cellular Phone Use With Clear Voice Technology For Best Voice Reception Sleek Design Standard Usb Charging Convenient standard USB charging (cable included) Built-in subtle microphone for mobile phone use (Hands-Free) with clear voice technology for best human voice reception Echo canceling technology to further enhance phone conversation Remote Control functions (AVCRP) on headset Bluetooth Version 2.1