Features1Adjustable Voltage: The tattoo power supply has an adjustable voltage of 3?12V, and the adjustment voltage accuracy is 0.1V, which can meet the speed requirements of tattooists. 2LED: The tattoo pen battery set has a large LED digital display screen, which makes the voltage output display more accurate, which is very convenient and practical. 3Lightweight And Compact: The tattoo power supply kit is light and compact, allowing the power supply and your tattoo pen to be integrated into one, and operate freely. 4RCA: The interface of the tattoo power supply is a standard RCA interface, which is suitable for most tattoo machines with RCA interface. It is tightly closed and not easy to fall off. 5Large Capacity Battery: The tattoo power supply has a built in 1500mAh large capacity battery, which can continue to work for about 7 hours when fully charged and 5V working voltage. For large area tattoos, the 2 power sources can be used alternately.SpecificationItem Type: Tattoo power supplyMaterial: Aluminum alloy, silicone, electronic componentsProduct Size: Approx. 33 x 52mm / 1.3 x 2inBattery: Lithium battery 1500mAh(built in)Output Voltage: 3-12V adjustable, adjustment accuracy 0.1VPower Interface: RCA interfaceCharging Port: USB type CCharging Voltage: DC 5V /1ACharging Time: 2-3 hoursDuration Of Battery Life: When fully charged, the 5V working voltage can continue to work for 7 hoursPackage List1 x Tattoo Power Supply 1 x USB Charging Cable