Looking to tame your hissing high-gain amp or silence your string of stompboxes? The Smart Gate is equipped with three selectable types of noise reduction to handle most types of signal. It bites down on sizzle and hum without cutting into your detail of your guitar playing. This Smart Gate is in great used condition, and has velcro on the back. You can power this the M135 by a 9 volt battery or a 9 volt power supply.