DIY Simple DC Electric Motor Model Assembly Kit - Physics Science. Features: Manual installation allows the user to understand the main structure of the electric motor. Verify the relationship between rotor rotation and current direction and magnetic lines. Master the principle of motor operation. DC Electric Motor Experiment: Input 3V - 6V DC through wires and terminals; the coil will rotate and increase speed as the voltage increases. To avoid short circuits, the two electric brushes should never contact the commutator segment. Its working voltage is DC 3.0V-6.0V. DC12V is not recommended. Specification: Working Voltage: DC 3.0V-6.0V; Usage: Used to study magnetic field lines; DIY Manual Exercise; School Educational Project; Creative Gift. Magnet Size: 22x20x20 mm (0.86x0.79x0.79 inches); Magnetic Flux Density: Greater than or equal to 72mT; Operating Temperature: -20~70; Operating Humidity: 5%~90% RH; Material: Plastic + Metal + Copper Package Contents: 1 * Motor Model. Only the above package content, other products are not included.