wireless 4.0 USB Adapter Bluetooth Dongle, GRANDCOW mini usb adapter for PC Windows 7 8 8.1 10 Vista XP, Stereo Headset Compatible Please NOTE: GC.Tech store is the only authorized seller by GRANDCOW. Each adapter has a "GRANDCOW" logo on it. Connect your computer/laptop with Bluetooth enabled devices such as mobile phones, printers, headsets, stereo headphones... Compatible with 32 bit and 64 bit Windows 10/ 8.1 / 8/ 7 / Vista / XP (Not compatible with mac os) Backwards compatible with bluetooth versions 2.1/2.0/3.0 Built with the latest bluetooth specification v4.0 class 2, High speed up to 3 Mbps wireless transmitter