Avantree DG40S Bluetooth usb dongle/bluetooth adapter creates cable-free connections between your PCs and other Bluetooth devices such as Bluetooth enabled speakers, cell phones, keyboard or mouse at speeds of up to 3 Mbps. And it is fully qualified Bluetooth 4.0 system and it smoothly supports backward compatible Bluetooth V3.0/2.1/2.0/1.1 and Bluetooth Low energy. It’s compatible with Windows 7/8 …