Electro-Harmonix SLAMMI Guitar Pitch Effect Pedal with no moving parts Advanced new algorithm that sounds great and provides glitch-free tracking; Up to three-octave maximum bend Create harmonies by mixing your dry signal with the effect MAX BEND Control acts as an 11-way switch to set the maximum bend/interval. Choose Detune,  Step, Major 2nd, Major 3rd, Perfect 4th, Perfect 5th, Major 6th, Minor 7th, 1 Octaves, 2 Octaves or 3 Octaves/Dive Bomb Precision control that lets you smoothly sweep your guitars pitch up or down; Sweep direction can be reversed so maximum pitch bend is in the heel-down position Super responsive design with no moving parts, nothing to wear out or break; Comes with 9 Volt battery, 9.6DC-200BI power supply optional