The MXR M-135 Smart Gate Pedal gives you 3 selectable types of noise reduction: Hiss, Mid, and Full. Bites down on hiss and hum but lets all of your music shine through. Intelligent design provides dual high and low adaptive filters, opens at lightning speed, introduces no extra distortion, and lets you control the sensitivity of the gate"s threshold. The MXR M-135 Smart Gate Pedal features hardwire bypass with footswitch and slim, tough stompbox housing.3 types of noise reduction, selectable Dual high and low adaptive filters Very quick response Introduces no extra distortion Threshold sensitivity control Hardwire bypass with footswitch Slim, tough stompbox housing