... 1.Bluetooth V4.0 class2 (also compliant Bluetooth 2.1+EDR) 2.OS supported :windows 7, vista ,xp 3.Dual-mode Bluetooth fully qualified Bluetooth ... V4.0 specification USB Dongle, support Dual-mode Bluetooth/Bluetooth ... me, Proximity, Generic Attribute Profile Bluetooth 2.1+EDR Support A2DP, AVRCP, DUN- ...