Joyo JF-38 Roll Boost; Effects Pedal for Electric Guitar; Boost pedal with up to 35dB gain; Controls: Gain; LED: Effect On; Footswitches: Effect Bypass; Connections: Input (1/4"" Jack), Output (1/4"" Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; powered by a 9 V Battery or a 9 V DC Power Supply (not included); suitable optional Power Supply: Item no. #409939; True Bypass; Dimensions (W x D x H): 68 x 118 x 50 mm (2,68"" x 4,65"" x 1,97""); Weight: 200 g (0,44 lbs)