Feature: 1. Understand the circuit and the necessary components include batteries, battery cases, conductors, electromagnets, and other devices that can help generate current. 2. Best simple fun DIY materials for beginners, connect and build your own experimental electrical and magnetic circuit inventions. 3. The perfect hands‑on course to teach thinking, engineering skills and creativity in the classroom or outside of school. 4. Loved by teachers, parents and DIY enthusiasts, powered by 2pcs AA battery (not included), high sensitivity and convenient operation. 5. Used as a development tool by educators in classes, summer camps and schools around the world. Specification: Item Type: Physics Circuit Kit Material: Plastic Battery: 2pcs AA (Not included) Part of the experimental operation is as follows: Experiment 1: magnetic car, using the principle of the same type of magnets repulsion, note that the use of magnets and magnetic car to achieve the same type of repulsion, magnetic car can run Experiment 2: circuit connection, light a bulb, need to use a power supply (battery box + battery), switch.Wire, lamp holder, bulb.The elements needed for the circuit can be learned by switching on and off.As soon as the circuit is closed, the light bulb lights up. Experiment 3: Series and parallel. In everyday life, we connect multiple light bulbs. How does this work? What kind of connections are there? Series: a switch can control multiple light bulbs, multiple switches to control a light bulb Parallel: one switch controls one bulb without affecting each other Experiment 4: the production of red green light pole tube, wiring must pay attention to can not be reversed.Are the red green lights in series or parallel? Experiment 5: DIY electromagnet, electrified conductor is surrounded by a magnetic field, an electromagnet is energized into a magnet, it can absorb coins, nails, etc., If you want to increase the magnetism, add a battery in series, the electric rheology in the circuit is large, and the magnetism of the electromagnet is larger. Note: This circuit can not be energized for a long time, the circuit is a short circuit, heating is large, be careful not to be burned by the electromagnet!When the compass is placed close to the coil, the compass will be deflected, means that there is a magnetic field around the coil when it is energized. Package List: 1 x SPDT Switch 2 x SPST Switch 2 x Base 1 x Cassette1 x Buzzer2 x Battery Box 1 x Red Green Light6 x Cable 1 x Electromagnet1 x Compass1 x Bag of Foam 1 x Bar Magnet1 x U-Type Magnet1 x Magnetic Car 4 x Light Bulb1 x Artificial Fur 1 x Tube