This 4 Watt USB LED light bulb is ultra bright and ultra portable at just over 3.5 ounces. A fraction of the weight and size of traditional heavy lanterns, use it for camping, reading, or any task that requires an even distribution of light. A critical item in any emergency kit. Highly durable – shatter, shock, and vibration resistant. Will fully illuminate a tent at night. Power it from any standard USB source – compatible with all USB wall plugs, USB batteries, and laptops.