NUX PA-2 Portable Acoustic Guitar EFX Brand New Effect Pedal PA-2 has a big LCD screen display, 3 acoustic simulation sounds, phase reversal switch It has 3 variable speed modulation effects including 3 chorus types and delay, room and hall reverb It is also built-in metronome with selectable rhythm patterns and tuner with chromatic, guitar mode Pa-2 is the most convenient portable programmable acoustic guitar effects processor Aux in makes it easy to jam along with an external music-playback device (mp3 player, etc.)