Asus USB-BT211 - Manual (Page 18)

13 USB-BT211
5. Use a passkey to pair with your Bluetooth device. Select one of the following
options, then click Next.
Choose a passkey for me
Select this option if the documentation that came with the Bluetooth device
you want to add does not specify a passkey and you want the Add Bluetooth
Device Wizard to generate a passkey for you.
Use the passkey found in the documentation
Select this option if the documentation that came with the Bluetooth device you
want to add specifies a passkey.
Let me choose my own passkey
Select this option if the documentation that came with the Bluetooth device
you want to add does not specify a passkey and you want to create your own
passkey.
Don’t use a passkey
Select this option only if the Bluetooth device you want to add does not support
a passkey.
We recommend that you create a passkey that contains 8 to 16 digits.