If you are thinking about going into car audio installation for a career this is your 1st step the books i have in mint condition are Basic Installers Guide, Second Edition Installer and First Class certificate Study guide, and Mobile Product Specialist Study Guide. These books are not cheap but i am moving as u see from my other posts and need to get rid of some stuff ill let them go for 15.00firm no low ballers this is my lowest price as these books retail for a lot more then u have to pay shipping and handling so this is a steal PM me or call me 813-843-0600