This LED hand-crank head lamp is great for safety in dark spaces. It has a built-in dynamo flashlight that provides ultra bright light. It doesn't need batteries and will never need a bulb. Crank for 1 minute to generate power for up to 30 minutes of light. Switch between 1 LED on, 3 LEDs on, or 3 LEDs flashing. Lightweight and rainproof, with clip-on headband mount.