The Double True Bypass Looper can externally control two non-true bypass stomp boxes. This looper is properly grounded which provides for quiet switching and zero bleed over. Loops can be activated one at a time or both at once. Power is only required to operate the bright LED lights and connects through a standard 9V boss style connector. Before clicking "add to cart" enter in your LED selection e.g. Loop 1 Blue, Loop 2 Green.