The Bluetooth USB dongle adds Bluetooth connectivity to your SIP-T46G with a wide variety of Bluetooth Headsets, allowing you to receive calls wherever you are in the office. Compatible with Bluetooth specification V4.0, back compatible with Bluetooth 1.1, 1.2, 2.0 and 3.0 for wide-rangging use. Main Features > Bluetooth specification: V4.0+HS system > Enhanced Data Rata (edr) compliant for both 2Mbps and 3Mbps supported > A2DP technology > Wideband audio support > Operating distance: 10 meters > Answer incoming calls through Bluetooth headset > Terminate calls through Bluetooth headset > Adjusts the volume o f Bluetoot h headset through Bluetoothh eadset or your phone > Multipoint technology for connecting with 4 Bluetooth devices at the same time > Bluetooth frequency range: 2.402GHz-2.480GHZ > Built-in security > Operation system: Windows 98SE, Windows 2000, Windows XP, Windows Vista etc. > Low power consumption Physical Features > Supports Yealink SIP-T46G and SIP-T48G > USB2.0 interface > Symbol rate: 3Mbps > Dimensions: 18mm*14mm*5.5mm > Weight: 2g Package Features > Qty/CTN: 40 PCS > N.W/CTN: 1.6 kg > G.W/CTN: 2.6 kg > Giftbox size: 119mm*113mm*26mm > Carton Meas: 310mm*275mm*290mm