Roland AC-33 30W Acoustic Chorus Guitar Combo AmplifierThe AC 33 is the worlds first battery powered amp made specifically for acoustic guitar. Portable yet powerful, the AC 33 provides true stereo sound, Guitar and Mic Line channels, custom tailored effects, anti feedback, and a Phrase Looper. But this amp was made to go places no amp has gone before. Thanks to its battery power capability, the AC 33 lets you take your act anywhere: into the backwoods, onto the streets, or wherever your imagination leads