Vafru MK-4.1 Bluetooth 4.0 USB Adapter Connect your Computer/Laptop with Bluetooth Enabled Devices such as Mobile Phones, Printers, Headsets, Stereo headphones and others Latest Bluetooth specification v4.0 Class 2 with low energy technology; Fully compatible with older Bluetooth equipment Compatible with 32 bit and 64 bit Windows 8.1/ Windows 8 / Windows 7 / Vista / XP Wireless range of up to 30 feet (10 meters) 2 Year Warranty .