A-power is a wireless machine equipped with two detachable power bolts with easily adjustable voltage. The capacity of the power bolt is 1800 mAh, has a battery life of up to 10 hours, the charging time 1.5hours,which has extremely low energy consumption and is more energy-saving.Artists can easily remove and replace this battery with an auxiliary one. This also a direct drive machine,? can be suitable for various tattoo effects, and its own a lower vibration. Specifications: Weight: 181g Stroke: 3.5m Diamater : 27mm Speed: 8V/11000Rpm Battery : 1800 mAh Working Voltage: 4V-12V