Note:Win 7 need to install drivers.If your computer system is Win8.1/10/11, you do not need to install the driver. It is driver-free for Win8.1 and above system. This product is not supported on Mac OS/IOS system. Name: USB Bluetooth 5.3 adapter Model: BT804 Bluetooth version: 5.3(BLE low power consumption, low delay) Main control chip: RTL8761BW Transmiion distance: 20m (in barrier-free environment) Support protocols: A2DP,HSP,AVRCP,HID, etc. Packing size: 13.3 * 10.8 * 1.8cm. 5.3 Bluetooth dual-mode and dual-channel, compatible with Bluetooth 2.0,3.0,4.0,5.0 and 5.1 specifications. Intelligent low-power chip, RF transceiver, providing lower delay, flexible and powerful Bluetooth application. Support Ca2 Power level 20 meters distance (in open environment) Support Bluetooth 5.3 dual-mode specification (LMP 12.45 real Bluetooth 5.3 standard) Support USB2.0/3.0 interface. Support multiple devices to connect at the same time (up to 7 devices can be connected) Working temperature -20 to 70 Operating system support: Windows 8.1, 10, 11 (driver-free, plug and play), Windows7 system can be installed with drivers. Support protocols: HFP/HSP (hands-free phone/headset) A2DP/ AVRCP (stereo music) HID/HOGP (keyboard and mouse), Android smart phone, etc. Packing list: Bluetooth 5.3 Adapter *1 English instruction manual *1