The DYNAMO® is both fun and practical. Just squeeze the handle for a bright light—without batteries! This unique flashlight is actually an electrical generator which used a magnetic field (and your kinetic motion) to create an electric current. The special transparent casing allows you to see the inner workings of the DYNAMO® as it generates electricity. Features: • Spare light bulb included • Scientific explanation on the back • DYNAMO® comes in a sturdy "Try Me" blister card