Ultimate Survival 10-Day Lantern The Ultimate Survival 10-Day Lantern is a safe replacement for candle or gas lanterns. The construction of the 10-day lantern is rugged for outdoor activities and great to have around as an emergency backup lighting. This lantern is battery operated by 4 D cell batteries, and has 12 Ultra Bright LED bulbs. Energy Efficient LED bulbs last over 100,000 hours, providing an amazing 10 days burn time on the low setting or 40 hours burn time on the high setting. The lantern has a brightness dimming switch that is adjustable, the LED bulb keeps the lantern cool. The Ultimate Survival 10-Day Lantern has a beautiful translucent brim, giving it a cool look. And a 360 light output that floods the room with an ultra-bright light, plus it is weather-resistant!