Features: 1, 5.3 Bluetooth dual-mode dual-channel, compatible with Bluetooth 2.0,3.0,4.0,5.0 and 5.1 specifications. 2, Intelligent low-power chip, RF transceiver, to provide lower latency flexible and powerful Bluetooth applications. 3, Support Cass2 Power level 20m distance (in open environment). 4, Supports Bluetooth 5.3 dual-mode specification (LMP 12.45 true Bluetooth 5.3 standard). 5, Support USB2.0 or 3.0 interface. 6, Supports simultaneous connection of multiple devices (a maximum of seven devices). 7, Working temperature -20 to 70℃, 8, Support operating system: Windows 8.1, 10, 11 (no driver, plug and play). Supported protocol: HFP or HSP(hands-free phone or headset)A2DP or AVRCP(stereo music)HID or HOGP(keyboard and mouse). Android smartphones, etc Specifications: Product Name: USB Bluetooth adapter Bluetooth version: 5.3 (BLE Low power, low latency) Transmission distance: 20 meters (in barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, etc. Chip: RTL8761BW Size: 3.4cmx1.8cmx0.8cm Compatible with: Bluetooth 5.4 or 5.3 or 5.1 (win7 or win8.1 or win10 or win11) Feature1: USB Adapter for PC Computer Laptop Feature2: Wireless Transmitter Receiver Feature3: Audio Bluetooth Dongle Package includes: 1x USB Bluetooth Adapter 1x Dust Cover 1x Manual 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.