A-grade used backlit US layout keyboard unit for backlit versions of the 1.25GHz, 1.33GHz & 1.5GHz (Bluetooth 1.1) models of 15" Aluminium PowerBook G4. This part will not fit the BlueTooth 2 version of the 1.5GHz PowerBook and will not work with any model which did not originally come with a backlit keyboard. Note that the 1.33GHz model was available in backlit and non-backlit keyboard versions.