The Alesis GuitarFX is a 24-bit multi-effects signal processor that has 80 preset programs that can be edited by the user. Also has 9 effects modules, each with multiple selectable effects -- over 40 different effects with innumerable effects combinations as well as 8 different signal routing options for re-ordering effect modules. Operates with either a standard 9-volt DC barrel type negative center power adapter or 4 AA size batteries.