LiiR Bluetooth 4.0 USB Dongle Adapter Compatible with Windows 10, 8.1 / 8, 7, Vista, XP Plug and play Bluetooth USB adapter creates cable-free connections between your PCs and other Bluetooth devices such as Bluetooth enabled headsets, speakers, cell phones, keyboard or mouse at speeds of up to 3 Mbps Newest Bluetooth class 2 Smart Ready specification with v 4.0 low energy technology. Backwards compatible with Legacy Bluetooth Equipment Bluetooth 3.0, 2.1, 2.0 and 1.0 Equipment Enhanced Data Rata (EDR) compliant for both 2 Mbps and 3 Mbps modulation modes with gold plated connector. Latest Bluetooth specification V4.0 class 2 with low energy technology High speed up to 3 Mbps wireless transmitter