Hardware Interface：USB Color：Black Item Dimensions LxWxH：0.5 x 0.2 x 0.8 inches Data Link Protocol：Bluetooth, USB Item Weight：3.2 Ounces Packing: 1*Bluetooth USB adapter Designed for Windows. Plug and Play for Windows 8/10 system. Driver only needed when your Windows 7 and lower system need to connect audio device,but connect mouse,keyboard and cell phone no need to install driver Transsmission Rate: Bluetooth adapter supports maximum transfer rate up to 3Mbps and transmission distance up to 33ft/10m in open space. High Compatibility:Support 32bit/64bit Win 10/8/7/ Vista and XP,enables PC or laptop to connect bluetooth-enabled devices, like smartphones, mouse,speakers,headsets.Not work with Mac OS,Car stereo systems or TVs Low Energy: USB bluetooth dongle applies the latest bluetooth 4.0 with low energy (BLE) technology and it is backward compatible with bluetooth V3.0/2.1/2.0/1.1 Extremely Small: Small size allows you to leave it on laptop or pc,no need to remove,it seamlessly gets plugged into a computer/laptop without blocking surrounding usb ports,save space