Bluetooth V4.0+HS system, A2DP technology. Bluetooth frequency range 2.402GHz-2.480GHz. Enhanced Data Rate (edr) compliant for 2Mbps and 3Mbps. USB 2.0 interface. Uses Multipoint Technology to connect with 4 Bluetooth devices at the same time. Wideband audio support. Operating Distance up to 10 meters. Answer/Terminate calls through wireless headset. Supports Yealink SIP-T46G. Anticipated to ship August 2013.