Power under sunlight during the day or just crank to recharge whenever you need light. Has bright or blinking 3 LED"s to light your way. One minute of cranking makes about 60 minutes of 3 LEDs light. Also waterproof up to 16ft of water and it floats. Thick ABS housing, long life PV cell, eco-friendly built-in NiMH rechargeable batteries, no external batteries needed and 50,000 hours of LED"s. It"s a fantastic flashlight for around the house, in the car, camping, outdoor activities or emergency.