Advantages: 1. Super bright LEDs, 1 minute Wind-up gets you up to 60 minutes light. 2. Generate power anywhere anytime without power source. 3. Free of Carbon-Zinc, Lead-Acid or NI-MH battery flashlight(money-saving & environmentally friendly) 4. Emergency helper against disasters - earthquake, typhoon, power failure....... 5. Good for housework, maintenance, traveling, mountain-climbing & more...... 6. Mobile phone charger for various mobile phones. 7. Siren function.