A Variable voltage mod is a vape devices that power your atomizers. They use rechargeable batteries to send power to your atomizer which results in e-liquid being burned into vapor. These mods differ from other mods because they have a microprocessor which regulates power output. Mechanical mods, hybrid mods, and unregulated box mods on the other hand do not have a controlled power output. Variable voltage mods are the safest and most popular type of mod because of the microprocessor which prevents the atomizer from receiving too much power. Vapers who use sub ohm tanks should only use variable voltage mods because of wattage requirements that come with the tank’s pre-installed coils.