"Mods" are large battery holders, usually with a tank or dripping atomizer attached for your e-liquid.
Mechanical mods are basically just a battery holder with no electronics whatsoever, so no variable voltage, no battery protection. We recommend that you use protected batteries with mechanical mods, or a kick of some sort.
Electronic /Digital mods usually have some type of circuitry and even LCD or OLED displays, usually you can vary the voltage and the electronics will provide some form of battery protection
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