■ Safe to have one in one room. It has a built-in small dynamo as a manual power generator, so you can charge it by hand cranking. Be sure to have one in your home as an emergency evacuation tool. ■Charging: The handle charges the main unit / charges the solar panel. Hand Crank Charging: Turn it by hand for about 8 minutes to turn it on for 1 minute.(2.5 rpm speed) *This is only a guide.It will vary greatly depending on the humidity when in use, and the speed of hand cranking. Solar Charging: Please charge it directly under sunlight on a sunny day. - 3-light LED flashlight, highly portable flashlight, no batteries required, and strong enough for emergencies, with a hook. It can be attached to your car keys, mobile phones, backpacks, bags, and other items that are usually close to you, so it is useful when you are in use. Product Contents: Hand crank charging light; Size: Approx. 4.9 x 1.8 x 1.3 inches (12.5 x 4.5 x 3.2 cm); Weight: Approx. 3.5 oz (100 g); Material: ABS; Power supply: Hand crank charging; Solar charging; Usage life: 100,000 hours.