feature: Mini vibrato effect pedal with true bypass. Traditional vibrato effect. The RATE knob adjusts the sweep rate of the vibrato effect. The RAMP knob is used to set the attack time of the vibrato effect. The DEPTH knob controls the intensity of the vibrato effect. On/off LED lights to indicate effect or bypass status. All metal shell, sturdy and durable, exquisitely exquisite. Specification: material: metalInput: 1/4" mono jackOutput: 1/4" mono jackPower supply: DC 9VWorking current: 300mAItem size: 9.5 * 4.2 * 3.3cm / 3.7 * 1.7 * 1. 3inItem weight: 175g / 6. 2ozPacking size: 10*6*6cm/3.9*2.4*2. 4inPackage weight: 210g / 7.4oz notes: The guitar shown in the picture is not included. Please use a 9V power adapter with a polarity of external positive and internal negative. Otherwise, the product may not work properly. packing list: 1 * Effect pedal1 * User manual (English and Chinese)