More energy efficient than regular LEDs, these military-grade mini-lanterns have 300 lumens and last up to 100,000 hours! One can light an entire room with a visibility of 2 nautical miles away. Lightweight, heat-resistant, waterproof and ideal for power outages, camping and more. Requires 3 AAA batteries (not incl). Set of 3, each: 3.5"Diam. x 5"H.