Internal 56K v92 modem board used in some iBook G4 models, 1.33GHz and 1.5GHz 12" Aluminium PowerBooks as well as G5 PowerMacs & iMacs, Mac minis and some eMacs. Please note that the model used in some 15" & 17" Aluminium PowerBook G4s is very similar and carries exactly the same manufacturers part number but the connector is different and the modems are NOT interchangeable. See compatibility the table below
Manufacturer's part #: U01M210

This is a used, tested & working part from a recycled iBook.

Compatibility table
12" Aluminium PowerBook G4	1.33GHz & 1.5GHz models only
12" iBook G4	1.2GHz & 1.33GHz models only
14" iBook G4	1.33GHz & 1.42GHz models only
eMac G4	Some models