Features1400MAH CAPACITY BATTERY: It has a built in 1400mAh large capacity battery, which can continuously work for about 4?6 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 5?12V, with a precise of 0.1V, to meet the speed demands of tattoo artists for different body areas.SpecificationItem Type: Wireless Tattoo Power Supply Material: Aluminum alloy, electronic componentsSize: Approx. 32 x 67mm / 1.3 x 2.6inBattery: Built in Lithium Battery 1400mAhOutput Voltage: 5-12V adjustable, adjustment accuracy: short press "+" "-" 0.1V, long press "+" "-" quick adjustmentPower Interface: RCA InterfaceCharging Interface: USB Type CCharging Voltage: DC5V / 1ACharging Time: 3 hoursBattery Life: 4-6 hoursPower On Function: Press and hold "+, -" keys simultaneously for 3 seconds to enable/disable the power on function.LED Screen Display: Current voltage + remaining battery capacityPackage List1 x Wireless Tattoo Power Supply 1 x USB Charging Cable 1 x Ring Switch Control Wire