Feature: 1. Adjustable Voltage: The voltage of our power supply is 5‑12V adjustable voltage, and the adjustment voltage accuracy is 0.1V, which can meet the speed requirements of tattooists operating different parts of body. 2. Convenience: Our tattoo power supply omits power cords, tattoo clip cord, and pedals, making it more convenient for tattoo artists to work. It is lightweight and is easy to operate. 3. Large Capacity: The tattoo power supply has a 1300mAh large capacity battery built in. When fully charged, it can work continuously for 3‑5 hours. When doing large tattoos, you can use the 2 power sources alternately. 4. Liquid Crystal Display: The tattoo power supply is equipped with a liquid crystal display, which can display the current voltage and remaining power, and it is convenient for the tattoo artist to observe and operate. 5. RCA: The interface of this power supply is a standard RCA interface, which fits for all standard RCA connection rotary pen tattoo machines, liner and shaders. Specification: Item Type: Tattoo Power Supply Material: Aluminum alloy, electronic component.Interface: RCA interface Battery: 1300mAh lithium battery (built in) Product size: Approx. 77 x 23 x 23mm / 3.03 x 0.91 x 0.91in Input: DC5V 1A Output: 5-12V 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 Tattoo Power Supply1 x USB Charging Cable1 x Manual