Slim Bluetooth 4.0 USB 2.0 Adapter Dongle for Windows, Mac Supports Bluetooth keyboards, mice, headsets, speakers and more CSR 4.0 chipset, low energy technology and dual-mode bluetooth transfer Works with most operating sytems including Windows, Mac OS X, Linux Backward compatible with earlier versions of Bluetooth 2.0 Bluetooth 2.1 Bluetooth 3.0 Compact and lightweight design, well integrated with computer to feel like a built-in device