From the brilliant ‘Artec’ company...This electro/acoustic instrument Analog Delay Pedal is suitable for use with any instrument that is fitted with an electric guitar type pick-up, electro transducer or piezzo pick-up. The Artec SE-ADL has ultimate control with three Pot's for adjusting the delay Repeat, Time and the Mix. This unit had digital circuitry that produces the vintage 'analog sound' (like the old echo chamber!) Also with its wide input range and high impedence it can be used with many kinds of musical instruments. Because of low noise and high output, it can be controlled with a wide range of input signals. Takes a PP3 9 volt battery, but can be powered by a separate DC 9 volt power supply (not included) Please see below for more details..