Top Dawg Electronics TDBTS Behind the Head STEREO Bluetooth Headset Stereo Bluetooth headset with back-hang style: Supports Bluetooth A2DP, AVRCP, and HS/HF profiles Up to 20 hours of music playback time and 400 hours standby Features Software and CVC echo/noise cancellation for reducing noise Foldable design provides maximum portability Wirelessly enjoy stereo music from all A2DP-enabled devices, such as mobile phones, PDA, PC etc.