Salt water lamps are great for camping, hiking, and any outdoor activity. This sustainable lighting option is used by pouring a saltwater mixture through the front outlet. Aluminum panels and natural air generate energy to drive the lights. A single refill of salt water can last up to 120 hours, and it also includes a USB outlet that can be used to power devices.Do you know about salt water lamps? This is the world's first lamp powered by salt and water!