Avantalk BTDG-20A Bluetooth Wireless USB V2.0 + EDR Class 1/100m Mini Dongle Adapter for PC / Laptop / Desktop / PDA / Printer Full 1 year warranty.Patent design Super small Bluetooth Dongle, suitable for connect to PC all the time Support Bluetooth Audio for VoIP, Class1 , 100M, Bluetooth V2.0+RDV,CSR chipset. Support Bluetooth Stereo (A2DP & AVRCP) EDR technology increase the data transfer speed to 3 times faster than normal Bluetooth on the market.