Check the listing for details. Shake Light 40-B Renewable Energy Flashlight Camping, STEM, Emergencies. Color: Clear, Condition: New. Listed at 19.95 USD. Shake Light 40-B Magnetic Induction Flashlight from EcoCentricNow LLC. A quality manufactured flashlight incorporating a magnetic charging system that generates electricity stored in a 3.6v NiMH battery. Compact in size, LED shake flashlight requires zero maintenance. Shaking the flashlight so the rare earth magnet passes through the copper wire coil charges the battery. SL40-B is perfectly suited for individuals who enjoy camping and hunting. It’s an essential emergency kit flashlight kept readily available at home, in the vehicle or at the office. Since 2010, this compact shake flashlight aids STEM program educators and students engaged in learning about a range of renewable energy concepts. On a full charge, Shake LED Flashlight SL40-B provides 2 hours of illumination. Recommended use is to operate the light for 15 to 20 minutes and then recharge the battery. Following this procedure shortens the overall time to restore the battery’s potential energy. Shake LED Flashlight SL40-B Specifications:Product Number: ECN00134UPC Number: 810346000134Beam Distance = 35 feet (10.7m)Beam Diameter = 6 feet (1.82m)Light Output = 25lm (30,000 mcd)Charge Time = 1 min shaking = 4 minutes of lightMaximum Light Duration = 2 hoursImpact Resistance = withstands repeated drops (1.5m)Storage Temperature = -4°F (-20°C) to 176°F (80°C)Battery = NiMH, 3.6V, 40mAh. Rated at 10,000 charges.LED Life = 50,000 hoursDimensions = Length 7 inches (18cm) Diameter 1.625 inches (4.2cm)Weight = 3.6 oz (101 grams)Limited Warranty = 1 year A Wonderful Science, Technology, Engineering and Mathematics (STEM) Education Mechanism. LED shake flashlights provide educators with a device that effectively demonstrates a variety of “renewable energy” physics concepts including magnetism, Newtonian Relativity, Faraday’s Law, Snell’s Law and more. Shake LED Flashlight SL40-B enhances STEM learning as a demonstration tool that supports meaningful and inspiring lessons which focus on engineering challenges and solutions requiring student initiative and creativity. Shake flashlight lightweight and compact design is ideal for storage in the glove box, drawer, backpack, tackle box or tool kit; although, we suggest the Light Finder Glow N Dark wall mount for ease of access and use. This rechargeable LED flashlight provides peace of mind knowing you always have a functional light source without the hassle of purchasing replacement batteries.