Aroma Electric Guitar Effect Pedal True Bypass with Aluminum Alloy Housing (Metal) High gain distortion, low power consumption. True bypass design, minimize tone loss and get more control of your pedal. 3 adjustable knobs: Gain, Tone, Level Aluminum alloy housing, sturdy and durable. Durable jacks and foot switch. Designed with on / off LED, instructs effects status. Powered by a 9V AC power adapter or 9V battery(neither included).