JOYO Boost Pedal Classic Circuitry up to 35dB Clean and Clear Boost for Electric Guitar Effect - True Bypass (Roll Boost JF-38)JOYO Roll Boost effect pedal clean clear transparent boost guitar tone; a flip of the switch gives you up to a 35dB boost, supports a maximum input of 18V DC voltage. Excellent tone electric guitar effect pedal with true bypass provide transparent tone,minimize the tone loss to keep the best tone quality. Whole aluminium alloy housing classic stoving varnish finish, with small LED flash indicator shows the working state. JOYO is over decade of brand