Welcome, you are looking at a really cool piece. This is the Pigtronix Class A Boost pedal! This pedal is possibly the last word in big Class 'A' boost pedals with plenty of headroom. This incredible preamp has a great, warm tone even while delivering up to 20db of boost. This boost even works with a 9V or 18V adaptor, however an 18V adaptor is included for a warmer sound and more headroom! Perfect for fattening up clean tone, getting extra volume for leads, or even throwing your other overdrive pedals into a fury, this is definitely a pedal you need with your rig! We are an authorized Pigtronix dealer! Don't pass this by!