Engl Custom Alpha Drive, Effect Pedal for Electric Guitar, Overdrive, Pure analogue middle gain and vintage sound, Controls: Gain, Volume, LoFreq and HiFreq, True bypass, Power supply via 9 V DC power supply - negative centre (not included - matching power supply: Article no. #233089#), 6 V DC to 18 V DC possible, Zero loss protection circuit, Additional DC socket for power distributor (daisy chain), Power consumption: 15 mA