Features: Compact size noise reduction pedal, aluminum alloy shell, lightweight and durable. 2 working modes: HARD(hard effect of noise reduction)/ SOFT(soft effect of noise reduction), selected by the toggle switch. With one control knob for adjusting the noise reduction degree. True bypass, and with for indicating effect or bypass status. Specifications: Material: Aluminum Alloy Input: 14" Monaural Jack (Impedance: 1M Ohms) Output: 14" Monaural Jack (Impedance: 100 Ohms) Power Supply: DC 9V ( polarity is negative in the center) Working Current: 26mA Item Size: 3.8 * 9.5 * 3.5cm / 1.5 * 3.7 * 1.4in Item Weight: 205g / 7.2oz Package Size: 12 * 6.5 * 6.5cm / 4.7 * 2.6 * 2.6in Package Weight: 275g / 9.7oz Note: Please use the whose polarity is positive outside and negative inside. Otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual (English) Compact size noise reduction pedal, aluminum alloy shell, lightweight and durable. 2 working modes: HARD(hard effect of noise reduction)/ SOFT(soft effect of noise reduction), selected by the toggle switch. With one control knob for adjusting the noise reduction degree. True bypass, and with for indicating effect or bypass status. 2 working modes: HARD(hard effect of noise reduction)/ SOFT(soft effect of noise reduction)