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: Metal Signal Input: 1/4Monaural Jack (impedance: 470K Ohms) Signal Output: 1/4Monaural Jack (impedance: 100 Ohms) Power Supply: DC 9V adapter (center minus plug)(not included) Working Current: 128mA Item Size: Approx. 3.5 * 9 * 3cm / 1.4 * 3.5 * 1.2in Item Weight: Approx. 150g / 5.3oz Package Size: 10.5 * 6 * 4.5cm / 4.1 * 2.4 * 1.8in Package Weight: 175g / 6.2oz Note: 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 Pedal 1 * User Manual(English & Chinese)