What is a mod?
A mod is the battery and control unit. It pairs with a separate tank or atomizer, so you can choose the hardware that suits you.
Built-in vs. removable batteries
Some mods have built-in batteries; others use removable cells. Removable batteries must be handled, charged and stored with care, and only with the correct type for your device.
Choosing a tank
Check that the tank's thread and diameter fit your mod, and use coils rated for the power you plan to use.