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. PRE-SALE: 7-15 WORKDAYS PROCESSING TIMESpecification: Weight: 192 g Stroke: 3.5 MM Motor Type: Direct Motor Working Voltage: 5-12 V Speed: 12V/10500 RPM Diameter: 32 MM Length: 127 MM