Name: USB Bluetooth Adapter Model: BR01 Bluetooth version: 5.4 (BLE low power consumption, low latency) Transmission distance: 20 metres (barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, ACC, etc. Package size: 13.5*10.5*1.7cm Package weight: 20g Packing List: Adapter *1 Instruction Manual *1 Blister colour card packaging 5.4 Bluetooth dual-mode dual-channel, compatible with Bluetooth 2.0, 3.0, 4.0, 5.0, 5.1 and 5.3 specifications. Intelligent low-power chip, RF transceiver, providing lower latency, flexible and powerful Bluetooth applications. Supports Cass2 power level 20m range (in open environment) Supports Bluetooth 5.4 dual mode specification (LMP 13.X true Bluetooth 5.4 standard) Supports USB 2.0/3.0 interface Supports simultaneous connection of multiple devices (up to 7 devices) Operating temperature -20 to 70C Support OS: Windows 8.1, 10, 11 (driver-free, plug and play) windows7 install the driver can be used Support protocols: HFP / HSP (speakerphone / headset) A2DP / AVRCP (stereo music) HID / HOGP (keyboard and mouse) / ACC. Android smart phones and so on.