Over the Head Bluetooth Wireless Trucker Headset With Flexible Boom Mic 12 Hours Long Talking Time for Cell Phones 4x Noise Cancelling BH21 Multi-point connection, you can connect 2 Bluetooth devices with a Bluetooth headset simultaneously Support A2DP, AVRCP, Bluetooth headset and Hands-free mode. Support redial, call reject, volume control, etc. Faster connecting, clear sound, anti-interference. On-line chat through Bluetooth wireless transmitter,faster connecting, clear sound, anti-interference Over-the-head design, Crystal clear sound with DSP