Mod is the brain of the electronic cigarette, the mod comes in a variety of strengths (watts) and different sizes, there are different options, with built-in battery or removable battery.
The cartridge which connect to the mod, is the mouthpiece and the place for filling for the
E-liquid (alternative to tobacco smoke).
The cartridges comes in different sizes, each cartridge is adjusted to a different power and temperature, and can contain a different amount of liquid.
The mod + cartridge is the ultimate substitute for smoking cigarettes, hookahs and for people who like the act of smoking and want to make it healthier.