Internal Bluetooth 1.1 board used in the 1GHz, 1.25GHGz, 1.33GHz & 1.5GHz versions of the 17" Aluminium PowerBook G4s only. Both 1.67GHz models use the BlueTooth 2 board. Please note that the bluetooth board for the 12" & 15" PowerBook G4s, and the iBook G4 is very similar and even carries the same Apple part number but has a different connector and so are not interchangeable.