The Bluetooth USB dongle adds Bluetooth connectivity to your IP Phone 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-ranging use.
Supports Yealink SIP-T27G/T29G/T46G/T48G/T41S/T42S/T46S/T48S/T53
Video https://www.youtube.com/watch?v=yYbGuOYaWwE
> Answer/Terminate calls through wireless headset
> 10m Range
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 of Bluetooth headset through Bluetooth headset or your phone

> Bluetooth frequency range: 2.402GHz-2.480GHz

> Built-in security

> Operation system: Windows 98SE, Windows 2000, Windows XP, Windows Vista etc.

> Low power consumption