Sorry i took so long to reply but i got really swamped at work. I need at least 1 amp but i have seen tattoo power supplies up to 3 amps. Voltage i regularly use between 6 to 9 volts. I would like a unit that goes to at least 15 for the sake of just in case some weird setup comes into play. I apprecaite the response and info. The real key to the system I need is one in which i can set up to 4 diffrent voltage settings and and go to each by the flick of a switch or the push of a button