Compatible with Bluetooth 2.0/3.0/4.0/5.0/5.1 and other versions.To solve the problem that the computer does not have Bluetooth function, plug in the Bluetooth adapter to connect wirelessly and realize Bluetooth transmission.Win8.1/10/11 free plug and play.Support up to 5 bluetooth devices to connect at the same time, saving the location of the USB interface to meet various needs of users.Mini appearance, glossy texture, easy to carry.Note: The product is suitable for windows 8.1/10/11 system. for all IOS devices, including computers, iPads and iPhones.parameter:Type: USB Bluetooth AdapterBluetooth chip solution: ATS2851Version: Bluetooth 5.3Interface type: USBTransmission distance: 10MTransmission speed: 3 MbpsWorking frequency: 2.4G (MHz)Color: BlackMaterial: ABSSize: 15 x 14 x 5.5mmPackage Contents:1 x Bluetooth AdapterOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.