Shake this rugged LED flashlight for 30 seconds and get five minutes of renewable illumination. Powered by a magnet and wire coil that transform motion into electricity, using the principle of electromagnetism as explained in our book Everyday Science Explained. Plus, this flashlight features a second battery LED for instant, long-lasting light. Use them together or separately. Water- and shockproof case has a molded rubber grip to resist slipping. The superbright LEDs last for 100,000 hours each.

• Required: three AA batteries, not included
• 2 1/2'''W x 10 1/4''H x 2 1/2''D; 16 oz