This is probably the best practice bass combo ever. Natural sound through four 4" speakers, COSM technology for 6 excellent amp models as well as Octave Divider and mic preamp. 2 FX sections for Delay, Reverb, Chorus, Flanger and Touch Wah. Buil in metronome and rhythm section with pattern selection, tempo and variation. Compressor and tuner. Don't let the 2.5W +2.5W power fool you. This combo is powerful enough for those acoustic gigs and "unplugged"sessions. Operates with the included adaptor as well as 6 LR6 batteries, which is a liberating experience. Just take it to any jam or acoustic session, plug your bass in and start playing anywehere.