Use the REDesign Redhead passive A/B switcher to switch one guitar between 2 amplifiers, 2 guitars to one amp, or connect a tuner to the second output to tune silently between songs. The pedal has 1 input, 2 outputs, LEDs, and a heavy duty 3PDT footswitch. This is the deluxe version in the small enclosure measuring only 1.5 x 3.5 x 1 inches. Due to the small size, it does not use a battery. It runs on a standard Boss-style 9 volt adapter jack.