Wireless Tattoo Pen Kit 1800mAh Battery LCD Screen Rotary Tattoo Pen Machine with Replacement Handle Item Type: Wireless tattoo pen kit Material: Aluminum alloy, electronic components Machine Size With Wireless Power: Approx. 128 x 34mm / 5 x 1.3in Replacement Handle: Approx. 39 x 31mm / 1.5 x 1.2in Battery: Built in lithium battery 1800mAh Craftsmanship: CNC integrated fine engraving Stroke: Approx. 4mm Cordless Motor: Approx. 26 x 7mm / 1 x 0.3in  Speed: 9V 12000Rpm Battery Interface: Type c interface (USB C) Use Time: Battery output current is 2.0A, can work continuously for about 8 hours. Charging Time: Fast charging, no power state can be filled in about 1.5-2 hours Working Voltage Range: 5-12V Voltage Adjustment Accuracy: short press 0.1V, long press 0.5V Vibration Value: 1.1m/s2 Decibel: 49-52dB LCD: Current voltage, operating hours, the remaining power Structure: Integrated lithium battery pen structure, built in lithium battery, battery part can be rotated to remove. Needle: Universal market 99% of the tattoo cartridge needle