Reduces the noise from input signal without lowering the quality of your original signal.Adjusting the noise reduction degree: -70-+10dB. durable and sturdy. LED indicator shows working state. Small and exquisite,can save a lot of space on pedal board. Good Noise Gate The noise gate guitar pedal can reduce the noise form input signal and keep the quality of your original signal. At the same time in order to keep the tone is not be reduced. So, this noise gate guitar pedal in all aspects of the performance is good job. It have 2 Working Modes: Hard/Soft. Hard: Provide hard effect of noise reduction. Soft: Provide soft effect of noise reduction. and like most great effects pedals it has true bypass. True bypass provides transparent tone When the LED is lit up, the effect is on Specifications Input Impedance: 1m Ohms Output Impedance: 100k Ohms Power Supply: DC 9V (Plug polarity is Positive on the barrel and negative in the center) Working Current: 26mA colour: white Material: Zinc alloy size: 9.5 x 4.5 x 4.8cm Package Contents: 4 x Guitar Effect Pedal 4 x User Manual(English) Note Please note this pedal can NOT powered by batteries. Need a DC 9V power supply with negative in the center to power up.