Mast Tour Pro rotary tattoo machine pen machine: Durable machine with pen-like design, Flexible and lightweight for every style Gently and smoothly transfers ink to skin; suitable for all skin types. Effortless to cover and protect Efficient cartridge change and replacement. Compatible with all standard power supplies and wireless power battery <br>The Mast battery: Output short circuit protection & Input double charging protection 1. Press and hold the power button for 2-3 seconds to turn on and off 2. Click the power button 6V-11V power cycle replacement 3. Recall the memory of the last used voltage after each power-on call 10V/0.02 seconds. 4. When the power is working, it will automatically jump to the battery capacity display, and the indicator light is in the breathing state. 5. The five indicators represent 20%-100% of the power. Then click the button to automatically return to the adjustment voltage state 6. When charging, 5 indicators are showing the capacity status. When full, the indicator light is always on and the overshoot protection is entered. <br>WJX Cartridge Needles is patent design make the needles run extremely stable and smooth, have the Lowest Tin solder to avoid chemical process to ensure safety. Special Rebound - there is four special elastics that lighten the pressure the needles bar Medical Grade LG PC - made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant,impact resistant. Original Design - WJX patent cartridges design achieve better hitting skins performance