1LED DIGITAL DISPLAY: The digital screen on this power supply allows for precise voltage output display. This lightweight and compact power supply integrates seamlessly with your tattoo pen for an effortless operation. 21500MAH CAPACITY BATTERY: Equipped with an integrated 1500mAh battery, it can work continuously for approximately 48 hours when fully charged. For larger tattoos, alternating between 2 power supplies supports uninterrupted work. 3WIRELESS DESIGN: Shifting from conventional power supplies that require multiple accessories to function, the tattoo power supply eliminates the need for power cords, hook lines, and foot pedals, making the tattoo artist's job easier and more convenient. 4ADJUSTABLE VOLTAGE: With an adjustable voltage range from 412V, and an accuracy of 0.1V, the power supply has been designed to cater to the varying speed requirements of tattoo artists working on different body parts. 5RCA INTERFACE: Designed to fit most tattoo machines featuring a standard RCA interface, the power supply ensures a snug, secure connection that will not easily disconnect, facilitating a smoothness tattooing workflow.