Hand Crank Driven Electricity Generator Mechanical Emergency Power Supply Features: Amazing handheld electricity generator! Create power without batteries! Great for classroom physics teaching demonstrations. Simply turn the handle, the electricity generated makes the bulb bright. The faster you turn the handle, the more power you generate. Made with a clear plastic casing, students can clearly see the motor, gears and wiring. This grip style handle generator allows connection to electrical circuits. Screw out the miniature light bulb, can be used with almost any experiment requiring up to 6.3 volts DC. This science kit is perfect for demonstrating the energy transformed from mechanical to electrical. Specifications: Material: ABS Material No-Load Output Voltage: 6.3V Output Current: 0.2A Storage Method: Well-ventilated, dry, indoor temperature preservation Light Bulb Replacement: 6.3V, 0.3A Miniature Light Bulb Weight: 178g(approx.) Package Includes: 1 x Generator Note: Please don't overexert in order to avoid damage of the gears, 2 rounds per second is recommended.