Item Type: Noise Killer Input Impedance: 1M Ohms Output Impedance: 1K Ohms Power Requirements: 9V DC center negative Current Consumption: 30mA Product Size: Approx. 11.2 x 6.4 x 3.4cm / 4.4 x 2.5 x 1.3in Package List 1 x Noise Killer 1 x Battery Cable 1 x Noise Killer Footpad 1This is a noise gate pedal that can help reduce noise and hum from other pedals in the pedal chain (especially high gain distortion) 2There are two main controls. The sensitivity control indicates the level at which the noise gate is activated. At higher settings, anything below the coarse adjustment will be cut off 3The two-way selector switch controls whether the door is kicked in, to actively switch the steep volume reduction, or gently switch with a gradually decreasing volume 4Use aluminum alloy shell, aluminum alloy has higher strength, specific strength is close to high alloy steel, specific stiffness exceeds steel 5Come with good corrosion resistance, so the material of this product is very good