Note: This product is not supported on Mac OS/IOS systems. Features: 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 Cass2 Power level 20 meters distance (in an open environment) Support Bluetooth 5.3 dual-mode specification (LMP 12.45 real Bluetooth 5.3 standard) Support USB 2.0/3.0 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), Windows 7 system can be installed with drivers. Support protocols: HFP/HSP (hands-free phone/headset) A2DP/ AVRCP (stereo music) HID/HOGP (keyboard and mouse), Android smartphone, etc. Specifications: Name: USB Bluetooth 5.4 adapter Bluetooth version: 5.3(BLE low power consumption, low delay) Color: Red, green, blue Transmission distance: 20m (in barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, etc. Package Included: 1*USB Bluetooth 5.4 Adapter