Item Name: Bluetooth Adapter Chip: CSR8510 Bluetooth Version: Bluetooth V4.0 + EDR V2.1 / 2.0 / 3.0 Interface: USB 2.0 Frequency Range: 2.400-2.480 GHz Transfer Rate: 3 Mbps Color: Black Distance: 0-20 M System Supported session: windows 7/8/10 / Vista / XP / 2000/98 / me, etc. Item size: 21x16x5mm Warranty: 2 years