Rotary Tattoo Pen Machine Kit 2 In 1 Wireless LCD Tattoo Pen 2400mAh Double Battery RCA Interfance Adapter Cartridge Kit Black Item Type: Rotary Tattoo Pen Machine Kit Material: Aluminum Alloy, Electronic Components Machine Size With Wireless Power: Approx. 145 x 36mm / 5.7 x 1.4in Machine Size With RCA Adapter: Approx, 128 x 36mm / 5 x 1.4in Battery: Built In Lithium Battery 2400mAh (included) Process: CNC Integrated Engraving Needle Stroke: 2.4mm, 2.7mm, 3.0mm, 3.3mm, 3.6mm, 3.9mm, 4.2mm 7 gears stroke adjustable Motor: Approx. 18 x 27mm / 0.7 x 1.1in Vibration Value: 1.0m/S² Decibel: 36-39dB Motor Speed: 12V 10500RPM Battery Interface: Type C Interface (USB C) Charging Time: Fast Charging, No power state 2-3 hours can be full Usage Time: Sustainable Working 8-10 Hours Working Voltage Range: 4-12V Voltage Regulation Accuracy: Short press: 0.1V long press to quickly adjust the voltage LCD Display Content: Output voltage, battery capacity, operation duration, current frequency Structure: Integrated lithium battery pen structure, built in lithium battery, battery parts can be rotated and disassembled Needle: 99% of all cartridge needles on the market