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Also note the polarity

The results were similar to those observed in former smokers and are in line with results from earlier studies

An automatic timer to prevent long puffs that could cause overheating A temperature monitor to shut the device down if it overheats A battery monitor to check the cells voltage during use and charging A circuit to manage the charging process and stop charging when the battery is full A current monitor to ensure that the connected coil wont draw an unsafe current A resistance checker to ensure that the connected coil is within the devices supported resistance range and doesnt have a short circuit The safety subsystem in a vaping device needs to engage itself before the device begins to produce vapor, so the device runs through all of the safety checks listed above when you puff on it or press the fire button

Saves you from headaches later