Feature: 1. Adjustable Voltage: 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. 2. Large Capacity: Built in 1500mAh high capacity battery, fully charged state, can work continuously for 3‑5 hours, do a large area of the tattoo can be used alternately with 2 power sources. 3. LCD Screen: With LCD screen, you can accurately view the voltage, remaining power, working time and other conditions, more convenient for tattoo division . 4. Cordless Tattoo Power Supply: It 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. 5. Easy to Carry: The cordless tattoo power supply is lightweight and compact, so that the power supply and your tattoo pen into one, the is convenient. Specification: Item Type: Cordless Tattoo Power Supply Material: Aluminum alloy, electronic components Interface: RCAinterface Battery: Built in lithium battery 1500mAh 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, longpress 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: Longpress 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. Longpress "+" or "‑" to quickly increase or decrease the voltage; If you want to pause/restart during use, you can short press the power button.