SoundTech STAMP3 AMP3 Guitar Amp - Portable Music Station Instrument Amp, computer and MP3 speaker combo with slave speaker 4 Amp Sounds - Clean, Hot Tube, Over Drive and High Gain &amp; Integrated instrument tuner Connect MP3 player, CD player or computer and jam-along Line-out &amp; headphone jack Line-out &amp; headphone jack *3 cables, 9V battery &amp; ac adaptor included