The nuumi vaporizer has several functions to ensure safe use:
Safety shutdown: If you puff on the vaporizer for more than 6 seconds, the battery will no longer deliver any power. In this case, the operating LED lights up 3x.
Short-circuit protection: In the event of a short-circuit (Pod's resistance is less than 0.4 ohm), the battery will no longer provide power. In this case, the operating LED lights up 3x.
Overcharge Protection: Stops charging when the battery is almost fully charged.