A hand-crank flashlight is a portable lighting device that generates power through manual cranking. Instead of relying on batteries, users turn a handle to spin a generator, which produces electricity to power the light. This makes hand-crank flashlights useful in emergencies or outdoor activities where battery life may be limited. These flashlights often feature LED bulbs, which are energy-efficient and provide bright illumination. Hand-crank flashlights are popular for camping, hiking, and emergency preparedness kits, as they ensure a reliable light source without the need for disposable batteries. They are also eco-friendly, reducing waste and reliance on non-renewable energy sources.