Bluetooth In order two 'pair' one Bluetooth device to another, a passcode has to be exchanged between the two devices. When you first connect, one machine will ask you to enter a passcode... enter any 4 digit number. The other device will then ask you for a passcode. Enter the same 4 digit number. It doesn't matter what the passcode is, as long as you enter the same number at both ends. For details, see our Bluetooth page