This USB Bluetooth dongle applies the advanced Bluetooth 4.0 technology with low energy protocol support and offers a cable-free solution for your computer to communicate with Bluetooth enabled devices with high-speed transfer rates of up to 3Mbps at 50ft away. This Bluetooth USB transmitter applies the latest Bluetooth 4.0 with low energy (BLE) technology with Enhanced Data Rate (EDR) support, backward compatible with classic Bluetooth (1.x, 2.x, and 3.x) devices. Easy to use for file transfer, included CSR Harmony drivers for audio transfer. Ultra compact design and fingernail size can save space, you can leave the Bluetooth dongle in your laptop when you are on the go. The LED indicator indicates device status. Plug and Play for Win 10/8.1/8, no need to install the driver. For Win 7/XP/Vista, Please install the driver included firstly.