Features:1.RESconsider this control as how big the room where the echo is, you will understand2.CFR means tone control. LPF can add warmth to the effect, very practical and versatile3.PRD set delay time, MIX set the amount of reverberation, DECAY set the length of the reverb4.This overdrive pedal is very convenient for you to use, true bypass design minimizes tone loss5.Aluminum alloy shell with higher strength, specific strength is close to high alloy steel, specific stiffness exceeds steel, possess good corrosion resistance, so the material of this product is very goodspecification:Item Type: Reverb PedalMaterial: Aluminum alloy shellPower Requirements: 9V DC center negative(not include)Current Consumption: 50mAProduct Size: Approx. 11.2 x 6.4 x 3.4cm / 4.4 x 2.5 x 1.3inPackageList:1 xReverb Pedal1 xReverbPedal Footpad1 x User ManualNoteCustomers need to purchase an external power supply by yourself to be powered on