DIY Simple DC Electric Motor Model Assembly Kit - Physics Science. Features: Manual installation allows users to understand the main structure of an electric motor. Verify the relationship between rotor rotation, current direction, and magnetic lines. Master the principles of motor operation. DC Electric Motor Experiment: Input 3V - 6V DC. The coil will rotate and speed up as the voltage increases. To prevent short circuits, ensure the two electric brushes never contact the commutator segment. Recommended working voltage is DC 3.0V-6.0V; DC12V is not recommended. Specification: Working Voltage: DC 3.0V-6.0V Application: Study magnetic lines of force, DIY manual practice, school educational projects, creative gifts. Magnet Size: 22x20x20 mm (0.86x0.79x0.79 Inch) Magnetic Flux Density: Greater than or equal to 72mT Operating Temperature: -20~70°C Operating Humidity: 5%~90% RH Material: Plastic + Metal + Copper Package Content: 1* Motor Model (Only the above package content; other products are not included.)