The HydraCell FCM-L01 Mini Emergency Light is a convenient, LED emergency light with a water activated power source similar to the HydraCell HC2D fuel cell. Two bright LEDs provide light. Great for emergency storage in a day pack, first aid kit, or in the car. Always ready to go and can be activated simply using its package and water. The Mini Emergency Light can be stored prior to first use for years in its hermetically sealed packaging. It is activated instantly to full capacity simply by dipping the base in water. Once activated the Mini Emergency Light will operate continuously for several days. When it begins to lose brightness it can be temporarily re-furbished by dipping in water.