CF-B05 Bluetooth Adapter Specification Item Name: Comfast Bluetooth 5.1 Adapter Bluetooth Version: Bluetooth V4.1/4.2/5.0/5.1 Interface: USB 2.0 Frequency Range: 2.400-2.480GHz Transfer Rate: 3Mbps Distance: 0-50M (distance depends on the the situation, like wall woud block the signal) Adjustable Antenna:5dbi Supported: Windows 7/ 8/ 10/11 Note: Do NOT Support Macbook Package included 1* Bluetooth 5.1 wireless adapter Difference: CF-B05 Bluetooth 5.1 Adapter Support Win 7 /8.1/ 10/ 11 5dbi Adjustable Antenna CF-B03 Bluetooth 5.1 Adapter Support Win 7 /8.1/ 10/ 11 CF-B02 Bluetooth 5.1 Adapter Support Win 7 /8.1/ 10/ 11 CF-727B 1300Mbps Bluetooth 4.2 Wifi Adapter 2dbi Antenna Support Win 7 /8.1/ 10/ 11 CF-927BF 1300Mbps Bluetooth 4.2 Wifi Adapter External 2*3dbi Antenna Support Win 7 /8.1/ 10/ 11 CF-813B 650Mbps Bluetooth 4.2 Wifi Adapter 2dbi Antenna Support Win 7 /8.1/ 10/ 11 Note: Wifi Bluetooth Adapter BT driver Do Not support windows XP/ VISTA /Mac/Linux