Mxr M133 Microamp

This device adds a preset amount of gain using a single control.
With a guitar this lets you boost your signal for lead work
adjust between two different guitars with unmatched output
(i.e. humbucker to single coils) or it can supply a permanent boost
in a long effects chain where signal drop off is a problem. Power:
Single 9-volt battery or Dunlop ECB-003 AC Adapter - Controls:
Footswitch toggles amp on/bypass (red LED indicates on) Gain knob
adjusts total output volume when micro amp Is engaged