Roland Battery-Powered Acoustic Chorus Amp (AC33) Runs on AC power or eight AA batteries (accepts rechargeable NiMH types) (Best with Polaroid AA Batteries) 30 watts (15W+15W) of natural, stereo acoustic sound through twin speakers Runs on AC power or eight AA batteries (accepts rechargeable NiMH types) Dual-channel configuration: Guitar and Mic/Line channel Reverb, chorus, and ambience effects (Ambience adds spatial, 3D-type depth to the sound)