Xnet tattoo power supply work with the majority of RCA rotary tattoo pen machines and assist tattoo artists enjoy portability and ease of use. How to Use: 1. Power ON/OFF: Long press "O" key for 2-3 seconds 2. Press the up and down power button 5V-12V power cycle replacement 3.Output Pause / Resume: Short press "O" key to pause the output, and short press it again to resume the output (the resume voltage is the working voltage before the pause). 4.Adjust Output Voltage: Press the "+" or"-" key to adjust output voltage. display shows 5-12V, each adjustment ±1V. 5. When full charging, the indicator light is always on. Specification: Material: Aluminium alloy and high quality insulating plastic Start Voltage: 8V Output Voltage: 5-12V Charging Method: Type-C Interface: RCA interface Battery Capacity: 4800mAh Charging Time: About 4 hours Working Time: About 20 hours Size: Approx. 3.14inches X 2.28inches X 1inches Weight：6.7oz Package: 1 x Xnet Tattoo power supply,1X 1.8mRCA Clip cord,1X Type-C charge cable