This pedal is fantastic. It combos on/off sound with a tuning-meter.
You can use 1x 9volt battery, or use a powersupply (not incl.)
The casing is very strong and built for proff-usage. Its easy to read the display when standing. And its easy to step on it, to click back and forth.
You dont get any small or slim pushbutton here, with "Boss" its a solid full plate click-pedal.