This is a quality, compact tattoo power supply. This lightweight power supply weighs only 30 grams and can literally fit inside your pocket! SIZE: 4.75″ x 3.3″ x 1.35″ (VERY SMALL). 10 Turn Setting. Input: AC 60v-250v 50Hz-60Hz. Output: DC 0-18v. Matching power cord. The variable setting is a 10 turn style for easy use. Output on this machine is from 0 to 18v with powerful yet stable current to operate ANY tattoo machine on the market. Great for travel.