This practically indestructible flashlight has no batteries, and is always ready to light your way, no matter how long its been left unused. 30 seconds of gentle shaking produces five minutes of light from the shatter-proof LED that, in the darkest of conditions, will illuminate a 6' radius at 35'. When shaken back and forth, a high-field-strength magnet passes repeatedly through a wire coil, charging the flashlights capacitor for months. Unlike a battery, the capacitor can be recharged several hundred thousand times, wont corrode, and operates even in extreme hot or cold. LED withstands drops, bumps, and age limitations that finish regular bulbs. Impervious to water, the flashli ght floats for easy retrieval when dropped overboard or into a pool. 11 1/2" x 2" diam. (14 oz.)