YOU WILL RECEIVE THE FOLLOWING WITH YOUR ORDER: ? A NEW 2.0 PNY 32GB USB-A FLASH DRIVE (CUSTOM CONFIGURED) ? Mountain Lion 10.8.5 ? A Written Detailed 10+ Instruction Guide w/Photos and Basic Troubleshooting, And A Extra Clean Install Guide as a bonus, so a total of over 15+ Printed Pages! ? 1/2 Hour Of FREE Mac Technical Support Via Chat/Text/Messenger From A 30+Year Certified Mac Windows Tech ? YouTube Channel Video's Made For My Customers For Extra Visual Install Help ? Custom Private Link To Download Extra Help And Guides PLUS BONUSES! If you are not sure which OS will work for your computer, please message me with the serial number of your computer and I'll be able to advise you. ??This installer has a USB-A connector. If you have USB-C Ports You WIll Need an Adapter. Supported Mac Models for Mountain Lion 10.8.5: iMac (Mid 2007 or newer) MacBook (Late 2008 Aluminum, or Early 2009 or newer) MacBook Pro (Mid/Late 2007 or newer) Xserve (Early 2009) MacBook Air (Late 2008 or newer) Mac mini (Early 2009 or newer) Mac Pro (Early 2008 or newer) System Requirements: OS X v10.6.8 or later 2GB of memory 8GB of available space