A/B SWITCH PEDAL It will become your best friend. You can connect two guitars to the same amp, use a tuner outside the pedal chain, have two guitars so you can alternate without having to connect and disconnect, mute your guitar on the fly, or in any situation where you need inputs and outputs, this pedal will do its job. It has a 2-color LED that will indicate which output is in use. This pedal is passive but requires power for the LED light. It works at standard negative 9V.