Model BT D650 Bluetooth Compliant Bluetooth V2.0+EDR (Class II) USB Interface USB1.1 and above Operating Range 10 meters ( 33 feet) Radio Frequency Range 2.4~2.48Ghz unlicensed ISM Weight 6g Connectivity CE, FCC, BQB Driver IVT BlueSoleil 1.6.1 or Higher Status Display 1 LED Certification CE, FCC, BQB Software support windows 98/98SE/ME/2000/XP