ASUS USB-BT21 - USB Bluetooth 2.0 Adapter - EDR (3Mbps) Ultra Tiny USB BT2.0 Dongle Latest Bluetooth v2.0 specification with EDR function enables data transfer up to 3Mbps Support 19 Profiles for Windows and 8 Profiles for Mac OS Support A2DP for Wireless Stereo Music Playback Based on USB 2.0 for fast data transfer and power supply no extra power supply needed