Features： 1、ADJUSTABLE VOLTAGE: Wireless tattoo power supply allows for adjustable voltage in the range of 4?12V, with precision of 0.2V, making it for meeting the speed requirements of different tattooing areas. 2、LCD DIGITAL DISPLAY: The large display screen on our power supply shows current voltage and remaining battery power, providing you with accurate information and easy operation. 3、LIGHTWEIGHT AND PORTABLE: Tattoo power supply is compact and lightweight, making it easy to maneuver during tattoo sessions and integrate seamlessly with your existing tattoo pen. 4、STANDARD RCA INTERFACE: Tattoo power supply features a standard RCA interface that fits most RCA interface tattoo machines, with a secure and stable connection that will not come loose during use. 5、RECHARGEABLE BATTERY: Tattoo power supply has a built in 1600mAh high capacity battery that can provide 8?12 hours of normal use after a 6?hour charge. Specification： Item Type: Tattoo Power Supply MAterial: Aluminum alloy, electronic components Interface: RCA interface Battery: Built in 1600mAh lithium battery Power Supply Size: Approx. 30 x 50mm / 1.2 x 2in Input Voltage: 5V Output Current: 50-1000ma Power: 0.5-12W Output Voltage: 4-12V Voltage Regulation Accuracy: Short press to adjust ±0.2V, long press for fast adjustment Display Screen: Displays current voltage and remaining battery power Charging Time: 6 hours (high voltage charger over 5V is strictly prohibited) Charging Interface: Micro USB Working Time: 8-12 hours of normal use. Package List： 1 x Wireless Tattoo Power 1 x USB Charging Cable