JOYO JF-31 Noise Gate Features & details Reduce the extra noise from your signal, and remain signal transparent allowing all your playing to go through. It is easily operated by adjusting the single threshold knob. True bypass design is used to minimise tone loss. Easy to use, input and output jacks. This noise gate is good choice for amateur and professional play. Material: Aluminum alloy Input impedance: 500K Ohms Output impedance: 1K Ohms Running current: 6mA Power: 6F22 9V battery / DC 9V adapter (Not included)