Mini Latest USB Bluetooth 5.4 Adapter for Pc/Laptop Make your desktop computer, laptop with Bluetooth function, link Bluetooth headset, Bluetooth slightly speaker, Bluetooth keyboard, etc., you can also upgrade your Bluetooth version. Adopt Powerful Bluetooth 5.4 Realtek chip The latest Bluetooth 5.4 Realtek chip is adopted to improve the performance in many aspects. Up to 5 devices connected simultaneously Note:Can’t Bluetooth-enable for TVs, car stereo systems;Doesn't support Mac or Linux operating systems;Does not work with keyboard / mouse accessories based on 2.4G wireless technology; Can the BT542 support more than one device at the same? Yes and the Bluetooth adapter can support up to 5 devices to work together at a time How do I install the driver for Windows 7? 1. Visit Driver Website from the User Manual and download the driver with Free charging. 2. Open the Zip file and unzipped the package, then double-click “Setup.exe” and follow up the wizard to complete the installation Why don’t the Bluetooth USB adapter pair and connect with my keyboard and mouse? Please be sure that your keyboard/mouse can support the 2.4G Bluetooth function, not ordinary 2.4 wireless technology. So your device must be Bluetooth devices.