Electro Harmonix Nano LPB-1 Booster
Electro Harmonix LPB-1, Effects Pedal, Booster, Controls: Boost, True bypass, Power consumption: 200 mA, Powered with a 9 V battery or 9 V DC power supply (coaxial connector - negative terminal inside - not included, e.g. Article Nr #409939#), Dimensions (WxDxH): 65 x 110 x 57 mm