This update is recommended for some Intel-based Macintosh computers running Mac OS X 10.5.8 and addresses an issue with AirPort performance while running on battery power. It may only be installed on:
MacBook (13-inch, Late 2007)
MacBook (13-inch, Early 2008)
MacBook (13-inch, Late 2008)
MacBook Pro (15-inch, Early 2008)
MacBook Pro (17-inch, Early 2008)
MacBook Pro (17-inch, Late 2008)