FENDER 1-BUTTON ECONOMY ON-OFF FOOTSWITCH Purchased new several years ago. It's a beautiful item, only used a few times at home. It can switch the FAT (boost) ON/OFF of the Blues Junior, so it can be used instead of a booster. Operation confirmed. Body only. FENDER's replacement genuine single-button footswitch. Can be used with the following compatible models. Specifications ■Footswitch ■For Mustang I, Mustang II, FM Series Amplifiers, Blues Junior ■1 button