THUNDERLOAD by DM Irons is an upgraded machine from DM Irons, enhanced 2200 mAh batteries High capacity of battery enables artists to work for a long duration of 6-8 hours, New OLED Screen, New Chip give better control over buttons. All THUNDERLOAD by DM Irons machines are of top-quality wireless tattoo machines with low price yet excellent quality. THUNDERLOAD by DM Irons machines are hand-assembled and tested by our in-house team, ensuring that each part is matched for a perfect fit. The THUNDERLOAD by DM Irons is extremely strong yet remarkably lightweight, allowing for ideal weight distribution and performance.