Features: 1. This is a power supply with RCA connection, which has adjustable voltage 4, 6, 7.5, 9, 10.5V to meet different needs. 2. With 2000mAh capacity and 6-8v voltage, can service for 2-3 hours. 3. Small and compact design, it is easy to carry and storage 4. Rapid charging speeds, can charging fully after 1-2 hours full, do not worry about running out the electricity. 5. An ideal tattoo tool for tattoo artists, suitable for powering tattoo machines. Specification: Item Type: Tattoo Machine Power Supply Material: ABS Optional Color: Black, Red Interface: RCA Package List: 1 x Power Supply 1 x Charging Cable Usage: 1. Long press the power button for 3 seconds to start up 2. Continuously press 2 to adjust the voltage 3. When working, the display lamp will flash to remind the current voltage and remaining power Note: Fully charged at a voltage of 6-9v, it can be used for 2-3 hours. Please arrange tattoo time reasonably.