Features: The Bluetoothcompatible Adapter surfaces adopt a 24K design, which can effectively prevent oxidation of the USB interfaces. for PC Bluetoothcompatible Adapter allows you to leave it on your laptops without disassembly, without blocking surrounding USB port, easy to carry, and space saving. Support Bluetoothcompatible 2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 specifications. Intelligent low-power transceiver, providing lower lates, flexible and powerful Bluetoothcompatible applications Supports Cass2 Power at a distance of 20meters (in open environment), supports Bluetoothcompatible 5.4 specifications true Bluetoothcompatible5.4), supports USB2.0/3.0, supports multiple devices to connect simultaneously (up to 7devices) Supported operating systems: Windows7, 8.1, 10, 11 (driverfree) Specifications: Material： ABS Item:USB Wireless Adapter Size:approx 26x14x9mm/1.02x0.55x0.35in Bluetoothcompatible：5.4 （compatible2.0, 3.0, 4.0, 5.0, 5.1, and 5.3 specifications） Supported Protocols: A2DP/AVRCP/DHID etc For Windows8.1/10/11 Package Includes: 1PC USB Wireless Adapter note: Due to the problem of lighting effectsand shooting angle, there mightbe certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.