Drive-free 5.4 Bluetooth adapter Product name: USB Bluetooth adapter; Model: BR04; Bluetooth version: 5.4 (BLE low power, low latency); Transmission distance: 20 meters (barrier-free environment); Support protocols: A2DP,HSP,AVRCP,HID,ACC, etc 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, provides low latency flexible and powerful Bluetooth applications; Support Cass2 Power level 20 meters away (in open environment); Support Bluetooth 5.4 dual-mode specifications (LMP 13.X true Bluetooth 5.4 standard); Support USB2.0/3.0 interface; Supports simultaneous connection of multiple devices (up to 7 devices can be connected); Operating temperature -20 to 70; Supported operating system: Windows 8.1, 10, 11 (no driver, plug and play); Supported protocol:HFP/HSP(hands-free phone/headset)A2DP/ AVRCP(stereo music)HID/HOGP(keyboard and mouse)/ACC. Android smartphones, etc.