It's powered by 6 AA batteries or by an AC 9 volt adapter (sold seperately) which can be stored inside the amplifier case. This little amp only weighs 5Lbs, but don't let its size fool you - its got a legendary sound that's huge! You can attach a standard guitar strap to the steel posts provided, and sling it over your shoulder for extra convenient mobility. The Legendary Pignose will never outlive its usefulness as a faithful and dependable traveling, practice, and recording amp. In addition, Pignose has a preamp outjack which makes it possible to play it through a large and more powerful amplifier. Some professional musicians use a Pignose as a preamp while performing. Anything you can amplify, you can play through a Pignose, including your own voice. More than a just a great guitar practice amp, the Pignose has that classic Little Walter, Chicago blues sound that harmonica players love!