New Wireless Tattoo Battery Tattoo Power Supply 2000mAh for Tattoo Pen Machine LCD Screen RCA&DC Connector  Mini Wireless Tattoo Power Supply Specification OPERATIONS -Press the power button to turn on or off - 2000mAh large capacity - LCD display. (Voltage, Remaining capacity, Timer)  - Voltage resolution 0.1v - Working voltage 5~12V - Press and hold the + or - button to turn up or down the voltage more quickly. PURCHASE NOTES - This model is NOT for Cheyenne or MAST pen. - Not included charger, please use your phone charger to recharge the battery - The LCD screen look like scratched but it's not, there is a very thin protective film on the screen. You can remove it. Disable JUMPSTART function: 1. Turn on the battery 2. Press and hold the POWER & DOWN button for 5 second till the screen flashes. RESET THE BATTERY If you find the battery switch off automatically weirdly. Please reset the battery:  1. Turn on the battery first 2. Press and hold the POWER & UP button for 5 seconds. Trouble shoot the battery issue * 10V Jump-start function enabled. (you can turn if off, see attached video above)  * If any problem occurs, please reset the battery: 1. Turn on the battery. 2. Press and hold the POWER button and Voltage-Up button for 5 seconds to reset Packing List - Battery pack * 1piece - USB Type-C Cable * 1piece