On Windows 10 or 11 (version 1703 and later):

1. Open the Control Panel (do not use Windows Bluetooth Settings).
2. Go to Hardware and Sound > Devices and Printers.
3. Put the keypad into pairing mode, shown by a flashing LED.
4. Click Add a Device.
5. Select your keypad from the list.
6. Click "Or try entering a passcode on it."
7. Type the random passcode on the keypad itself and press Enter. Do not use an example code from a manual.