1.1500mAh capacity. No more worrying about running out of battery as it can sustain your tattoo operation for up to 6 hours.2. Adjustable voltage. You can switch freely between 4.5-12V, and increase or decrease the voltage by 0.2V each time you press it to achieve different rotation speeds, which are more suitable .3. Widely compatible sockets. Special use of open spring core makes the product compatible with all RCA jack TATTOO and PMU pens on the market.4. Light weight, easy to use. Made of aluminum alloy, it is sturdy and , and will hardly burden your tattoo pen.5.LED display. Clearly displays voltage and remaining charge. Your tattoo operation thus becomes more attractive and convenient.6. The charging interface is stable. Easy to connect, not easy to fall off, to use.Item type: Wireless Tattoo Power SupplyInput voltage:DC 5VOutput voltage:4.5V-12VBattery capacity:1500mAhCharging time:5HWorking time:Normal use for 4-6HCharging Plug Recommend: 5V-1A(Not include)Don' use more than 5V charger (Damage machine on your own risk)Colour:blackMaterial:plasticPackage Contents:1 x Wireless Tattoo Power1 x usb cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.