Note: XP or Win8 or MacOS system is not supported. Features: x 5.4 Bluetooth dual-mode and dual-channel, compatible with Bluetooth 2.0,3.0,4.0,5.0 and 5.1 specifications. x Intelligent low-power chip, RF transceiver, providing lower delay, flexible and powerful Bluetooth application. x Support Cass2 Power level 20 meters distance (in an open environment) x Support Bluetooth 5.4 dual-mode specification (LMP 12.45 real Bluetooth 5.3 standard) x Support USB2.0 or 3.0 interface. x Support multiple devices to connect at the same time (up to 7 devices can be connected) x Working temperature -20 to 70℃ x Operating system support: Windows 8.1, 10, 11 (driver-free, plug and play), Windows 7 system can be installed with drivers. x Support protocols: HFP or HSP (hands-free phone or headset) A2DP or AVRCP (stereo music) HID or HOGP (keyboard and mouse), Android smartphone, etc. Specifications: Name: USB Bluetooth 5.4 adapter Bluetooth version: 5.4(BLE low power consumption, low delay) Transmission distance: 20m (in barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, etc. Package Included: 1xBluetooth Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.