This new device by Mass Mods in collaboration with Augvape requires a single high drain 18650 battery. The wattage output is determined by the state of the battery alongside the resistance of the attached atomizer. With that being said, we do recommend the knowledge of ohms law and battery safety. In addition, the minimum firing resistance of the Mass Mods S2 squonker is 0.2 ohm. A great feature to the mosfet is that it has water resistant coating, which helps protect it from any accidental misfires.