No batteries or bulbs to replace – use the top-mounted solar panel or the hand crank to charge the built-in battery. Safe to use by campers of all ages—no fuel to spill, no carbon monoxide and no fire danger. LEDs operate at high power (6 lights) or low power (3 lights) to provide the right amount of illumination. Use it indoors or out. Solar charge for one hour or crank the handle for 1-3 minutes for 1 hour of use. Solar charge for 5-6 hours for up to 5 hours of light. Includes carabiner clip to hang in a tent, from a tree branch or from a string line. DC port for cell phone charging (adapter sold separately).