Features:Like a guitarist control the volume knob and cut off the sound head, sounds like a violin.SENSE knob: adjusts the sensitivity of the effect.ATTACK knob: adjusts the speed of the attack.Micro size and full metal shell, portable and durable.With true bypass footswitch and LED indicator light.Specifications:Material: MetalSignal Input: 1/4″Monaural Jack (impedance: 470K Ohms)Signal Output: 1/4″Monaural Jack (impedance: 100 Ohms)Power Supply: DC 9V adapter (center minus plug)(not included)Working Current: 128mAItem Size: Approx. 3.5 * 9 * 3cm / 1.4 * 3.5 * 1.2inItem Weight: Approx. 150g / 5.3ozPackage Size: 10.5 * 6 * 4.5cm / 4.1 * 2.4 * 1.8inPackage Weight: 175g / 6.2ozNote:The power adapter is not included.Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.Package List:1 * Effect Pedal1 * User Manual(English & Chinese)