The PG-1 delivers what you want; when you are ready to rock out, wherever, whenever. Just bring your guitar and headphones, the PG-1 provides a metronome, tuner, and real guitar amp and effects modeling. Analog Preamp Two tuning modes (Chromatic, Guitar) Flat Tuning up to 2 semi-tones Built-in metronome with selectable rhythm patterns Two AA batteries provide more than 8 hours continuous play time AUX-IN makes it easy to jam along with an external music-playback device (mp3 player, etc.) Backlit LCD screen for tuner and metronome.