AB Switch Pedal will route your signal cleanly to either the A in/out or the B in/out. Use it to switch your guitar between two amplifiers or switch between two guitars connected into a single amp without plugging/unplugging cords. A red/green LED tells you if you are connected to A or B. The AB Switch Pedal is true bypass and completely passive so it will not degrade your tone. The AB Pedal doesn't require power. The LED can be powered by a 9 volt adapter or 9V battery. Compact size and ruggedly built, easily fits on your pedal board.