Fix Bluetooth: Check the PIN and Try Connecting Again - Technipages
How to Pair a Bluetooth Device to Your Computer, Tablet, or Phone
Windows 10 asks for device PIN even though it doesn't exist - Super User
Car Bluetooth Receiver (3.5 mm Pin) - Pair with Car Stereo, Music System, Home Theater System, Computer. Compatible with All Android & IOS Devices: Buy Car Bluetooth Receiver (3.5 mm Pin) -
Windows 10でBluetoothデバイスのPINが表示されない | by KADOTA, Kyohei | Medium