Volts= form 7 to over 11. Start up at 5 volts. It is a great machine for proffesionals tattoo artist and collectors. This machine is best for power colour, very heavy hitting. 10wrap coils height 32mm 1.26 inch, core diammeter 9mm 0.35 inch. 47uf x 63 volts capacitor.Completely hand made tattoo machine86 oz tattoo machines & guns terminals solder with silver for a best eprfomance with low voltage. Thank you for your interest adn good luck!