Korg Toneworks Modeling Signal Processor Unit - Blue/Silver Finish This unit takes (2) AA batteries to run or a Korg A/C adaptor. Adaptor NOT included. Great sound in a small, easy-to-use package! The Ampworks modeler is a stress-free way to experience real amp sounds in any situation. Since it's ultra-compact design enables it to fit into the accessory pocket of a guitar case, it's easy to take it along wherever you go. Features: Korg Toneworks Modeling Signal Processor Unit DC 4.5V In (Power Supply Not Included) (1) Footswitch Input (1) Input & (1) Output w/Line/Amp Switch ON LED Gain, Treble, Middle, Bass, Volume, Effects Depth Knobs Prog/Menu Button Amp Type Presets Cabinet Presets Effect Presets Tap Tempo Button Comes With Original Box & Instructions AA Battery Option (Batteries Not Included) Thanks for visiting Midlothian Music. Proudly serving your music needs as a family owned business for over 61 years. We have a large selection of instruments and accessories. Please call us with any questions or visit our website for more details. We are an authorized dealer, open 6 days weekly and shipping daily. Watch as we are posting more name brand gear daily. Any returned instrument is subject to a restocking fee!