Features:Built-in FET transistor， natural and clear sound.True bypass design， minimizes tone loss and get more control of your pedal.3 adjustable knobs: gain， level and tone.Aluminum alloy housing， good durability.Durable jacks and foot switch.Designed with on / off LED， instructs effects status.Powered by a 9V battery or 9V DC power adapter (neither included).Specifications:Input impedance: 500 kohmOutput impedance: 150 ohmRecommended load impedance: 10 kohmEquival input noise: -90 dBu or lessPower supply: DC 9V - battery or AC adapter��neither included��Current draw: 5.5 mA (DC 9V��Product size: 18.5 * 13.6 * 11.9cm / 7.3 * 5.3 * 4.7inProduct weight: 237g / 8.4ozPackage size: 21.5 * 16.2 * 14.3cm / 8.5 * 6.4 * 5.6inPackage weight: 281g / 9.9ozPackage List:1 * Overdrive/Distortion1 * User Manual(English & Chinese)