PARAMETER: Speed: 10,000 RPM; Stroke Length: 3.5MM; Needle Depth: 0-4MM; Output Voltage: 4-12V; Suggest Voltage: 6-9V; Battery Capacity: 2000mAh; Work Time: 6 Hours; Recharge Time: 1-2 Hours; Recharge Method: Type-C. DESCRIPTION: Lightweight Ergonomic Design-The NEEBOL QT81 tattoo machine weighs only 0.3 lb and features an ergonomic design that fits comfortably in the hand, helping reduce hand fatigue during long tattoo sessions. Powerful Coreless Motor for Stable Performance-Built with a coreless motor that reaches up to 10,000 RPM, this rotary tattoo machine supports 4–12V adjustable voltage and a 4mm stroke length, delivering stable performance for daily tattoo work. Color Screen Power Supply-The QT81 wireless tattoo machine is equipped with a color screen power supply, allowing artists to monitor the machine’s working status in real time for easier and more precise operation. 3 Memory Modes & NPS Dotwork Mode-This rotary tattoo gun features three memory modes for quick voltage switching, plus one NPS dotwork mode, making it suitable for lining, shading, and dotwork techniques. All-in-One Wireless Tattoo Pen-As an integrated wireless tattoo machine, the QT81 eliminates the need for extra cables and power cords, making it more convenient to use than traditional tattoo guns or a standard machine tattoo machine setup.