ADJUSTABLE VOLTAGE: The voltage of our power supply is is 5 to 12V adjustable voltage, adjustable voltage accuracy of 0.1V, to meet the needs of the tattoo artist to operate different parts of the speed. RCA INTERFACE: This cordless tattoo power supply is the standard RCA, suitable for most RCA tattoo machines, closed tight, not easy to fall. Easy to charge and carry, so you can even use it for work outdoors. LARGE CAPACITY: The tattoo power supply has a 1300mAh high capacity battery, fully charged state, can work continuously for 35 hours, do a large area of the tattoo can be used alternately with 2 power sources. CORDLESS OPERATION: Digital tattoo power supply get rid of the traditional power supply to use multiple accessories to work, omitting the power cord, tattoo clip cord, foot pedal, so that the tattoo artist work more convenient. LCD SCREEN: Wireless tattoo power supply is LCD screen display, you can accurately view the voltage, remaining power, working time and other conditions, more convenient for tattoo division operation. Specification: Item Type: Cordless Tattoo Power Supply Material: Aluminum alloy, electronic components Interface: RCA interface Battery: Built in lithium battery 1300mAh Power size: Approx. 62 x 32 x 32mm / 2.4 x 1.3 x 1.3in Input: DC5V 1A Output: 5-12V Output voltage adjustment accuracy: 0.1V, long press for fast adjustment Charging time: 2 hours (charging with a charger higher than 5V is strictly prohibited) Use time: Can be used for 3-5 hours Package List: 1 x Cordless Tattoo Power Supply 1 x USB Cable 1 x Manual How to Use: Long press the power button to turn on/off; Short press the "+" or "" key to easily adjust the voltage, each time it is pressed, the voltage is 0.1V. Long press "+" or "" to quickly increase or decrease the voltage; If you want to pause/restart during use, you can short press the power button.