11400MAH CAPACITY BATTERY: It has a built in 1400mAh large capacity battery, which can continuously work for about 46 hours when fully charged. This feature allows for uninterrupted work on large area tattoos by alternating between two power sources. 2RING SWITCH CONTROL WIRE: It comes with a ring voltage adjuster. Slide it onto your tattoo pen, and you can easily increase or decrease the voltage right on the ring, making operations more straightforward for tattoo artists. 3LED DIGITAL DISPLAY: The LED digital display on the the power supply ensures precise voltage output display. Its compact and lightweight design makes it seamlessly integrated with your tattoo pen for smoother operation. 4WIRELESS DESIGN: Say goodbye to the constraints of traditional power supplies that require numerous accessories to work. It omits power lines, hook lines, and pedal needs, making the tattoo artist work easier and more convenient. 5ADJUSTABLE VOLTAGE: It is equipped with an adjustable voltage ranging from 512V, with a precise of 0.1V, to meet the speed demands of tattoo artists for different body areas.