The Kao is a must-have. Some police corps use the Kao as an emergency light! This lightweight, mini flashlight with its two LEDs does not require batteries. Cranking the side handle will charge this flashlight. It also has a small solar panel to charge it by sunlight. It fits on to any key ring. The Kao comes in a variety of colours. Glow- in-the-dark is a definite advantage if you have to find it in the dark.