Mod’s are also known as devices, they are a means of controlling the power that goes through your coil. Using a regulated device is the safest way to vape. A regulated device is a mod that has safety precautions for the device getting too hot, low ohm coil, unsafe external battery. There are many kinds of mods out there, some allow you to do temperature control, bypass mode and some only have one setting. There are mod’s that have internal batteries, and some have external batteries that take 18650(being the most common), 20700 and different types of batteries. The basics of a mod are: a 510 connector, a button, a screen, fire button and wattage control buttons. Mod’s can vary in price due to design, functionality and power.