The Booster Guitar Effects Pedal brings 2 classic look to this pedal graphic with the broad capabilities easy to use, controlling both the gain the high end low end signal The Bass knob allows you to control the amount of low end in your tone Turn it up for a deep, full sound or turn it down to give a high end presence The knob controls the amount of high end sound you in your guitar Bringing it down helps for low droning effects while turning it up gives a pinging, attack The Volume knob at the top controls the overall output of the pedal Whether you to control all of your highs lows with the pedals, or manage a small part of it, this knob is capable of great control The Gain knob adjusts the initial effect that the bass knobs have, boosting the sound of your guitar Turning the gain knob up increases the effects of both the bass effects, also increasing the sound If you the pedal to have less of an effect on the EQ, turn the gain down for a controlled effect color:BlackMaterial:Zinc alloysize:95 x 44 x 48mmPackage Contents:1 x Guitar Effect PedalOnly the above package content, other products are not included Note: Light reflection different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is 1-3cm