Shake Flashlight Great for home, car, camper, boat, or emergencies / No batteries required / No bulbs required Powered by principles of Faraday's Principle of Induction / LED bulb / Waterproof case will even float Maintenance Free / 30 seconds of shaking powers LED for up to five minutes Overall dimensions (approx.) 1.5-inches diameter (at thickest part) x 7-inches long