The Allied Aqua Lamp Eco-Emergency Lantern is powered by a replaceable magnesium fuel cell and salt water. No batteries, fuel, electricity or sunlight needed. Magnesium bars are safe, non-toxic, eco-friendly and will last 25 years if kept dry. This LED lantern, once activated, provides over 100 hours of continuous light at 35 lumens and is rated IPX4 for water resistance.