The Mast Lancer wireless tattoo machine can work for 8-12 hours on a single battery, and it has a LED screen that displays operating voltage and allows for 0.1v voltage adjustments. The machine¡¯s battery capacity is 1500mAh and it has a body made of anodized aircraft aluminum, making it lightweight and precisely machined. The Mast Lancer also features jumpstart and memory functions, and has a stroke length of 3.5mm. The adjustable cartridge needle length can be changed from 0mm to 4mm by twisting the grip. Additionally, this tattoo machine comes with two replaceable wireless batteries that can be fully charged in 2 to 3 hours.