Engineered to provide the best Heavy Hitters vaping experience for Ultra & Live to preserve the flavorful terpenes and extend the life of the cartridge. LIVE by Heavy Hitters is best enjoyed at 2.0v (Blue light) For a fuller hit, fused with flavor try 2.5v (Green light) For an Ultra Heavy Hit select 3.0v (Red light) Compatible with all 510 thread cartridges, Micro-USB cable included