The REDesign Micro Boost provides a nice, transparent clean boost to drive your amp harder. The best part is that it is so small you'll barely notice it on your board! Due to the small size, it does not use a battery. It runs on a standard Boss-style 9 volt adapter jack. I build these myself one at a time and guarantee my work. I offer a 14 day trial period, if you are not completely satisfied send it back and I will refund your money (less shipping).