Two 1800mAh batteries can be replaced. High capacity batteries, one battery can work 4-6 hours, very easy to replace wireless parts. Machine function: 10V start-up. LED screen, the screen displays battery power, memory function, voltage, and usage time. Dragonhawk wireless tattoo pen machine is equipped with a vertical coreless motor, which is more powerful, more solid, and starts quickly. This tattoo machine featured with stable operation, stronger flapping force, stable center of gravity, and low noise.