The Electro-Harmonix Nano Signal Pad Guitar Pedal is a passive attenuator that allows you to instantly switch to a different preset volume. It"s like your guitar"s volume knob with a fully passive and color-free circuit. Leave your amp"s volume set high for overdrive, and use the Signal Pad Pedal to lower your level for a clean soundthen switch it off to kick in your amp"s natural overdrive. You can also experiment with the Signal Pad anywhere in your effects chainyou"ll bring out new tonal combinations from your favorite old pedals.True bypass Turn any single channel amp into a 2-channel setup Switch from lead to rhythm on the fly Use in front or after any effects to change the tone of that effect Battery Powered LED / power supply (not included)