Features: The Bluetoothcompatible adapter surfaces adopt a 24K gold-plated design, which can effectively prevent oxidation of the USB interfaces. Portable PC Bluetoothcompatible dongle allows you to leave it on your laptop or PC without disassembly, without blocking surrounding USB ports, compact, easy to carry, and space saving. 5.4 Bluetoothcompatible 2 modes 2 channel, compatible Bluetoothcompatible 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 specifications. Intelligent low-power chip, transceiver, providing lower latency, flexible and powerful Bluetoothcompatible applications Supports Cass2 Power at a distance of 20meters (in open environments), supports Bluetoothcompatible 5.4 two modes specification true Bluetoothcompatible 5.4 standard), supports USB2.0/3.0, supports multiple devices to connect simultaneously (up to 7 devices can be connected) Supported operating systems: Windows 8.1, 10, 11 (driverfree) Supported protocols: HFP (handsfree phone/headphone) A2DP/AVRCP (stereos music) /HOGP (keyboard and mouse) ACC. Androids smartphones, etc Specifications: Material: ABS Item:USB Wireless Adapter Size:approx 17x25x8mm/0.67x0.98x0.31in Bluetoothcompatible:5.4 (compatible 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 specifications) Transfer Distance:20M/65.62ft Supported Protocols: A2DP/AVRCP/DHID etc For Windows8.1/10/11 Note: Due to the problems of lighting effectsand shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC USB Wireless Adapter