1. The wireless Tattoo 3.7V lithium battery 1950mAh,RCA or DC Interface available for tattoo pen dedicated power supply,The Lithium battery specially designed for tattoo.

2. Lightweight: Just 2.1 ounces with a cube design that allows for a superior center of gravity for a more balanced feel in the hand, and the weight distribution balance with the tattoo pen does not affect the tattooist's operation.

3. It has a capacity of 1950mAH, Fully charged, Run 4 to 11 volts in 0.1v increments.

4. Three hours full charging working for 5-8hours

5.It is a LED-Digital Display rechargeable battery pack that provides high and efficient performance. 

6.Hold(+) button for 8 seconds to turn on and hold (–) button for 8 seconds to turn off.Press (+) and (–) to increase and decrease, respectively, the voltage by 0.1V

7.The digits that show "0-100" when turning on indicates how much battery is left, the LED digits will start blinking when the battery pack is low in battery, please recharge the battery pack immediately.

8.When charging, the LED digits' outlines will start circling. Once the battery pack is fully charged, the LED display will show a dash line (-) in the middle.

9. The package contains 1 pack Tattoo Machine Power Supply (RCA or DC) and a USB Type-C cable.

Note: In order to extend the battery life, it is recommended to charge and discharge the battery at least once a month.