I have 3 of these. Mark 2 HPF, phase and vol £70 SOLD Mark 1 HPF and Phase £60 Hybrid - £40. HPF and vol. One I had made for me which is now in a Boss pedal carcass. Standard Boss 9v power and switching to roll off some top end. It has an earth hum which means it will need some work so it is for someone who understands inside things.