TheTesla Invader 4 VV Box MOD! The high-end Invader 4 works with external dual 21700 batteries ( No battery included ) which can fire up to the max output of 280W. It is also compatible with 20700 and 18650 cells.( No battery included ) With the advanced chipset, the Invader 4 has multiple protections for your safe, powerful, accurate and efficient vaping experience. The Invader 4 comes with 5 levels voltage adjustment, meeting you different vaping needs. Definitely an ideal choice for the high wattage crew.