MPuzzle is a modular electronic product used to build circuits. Each module has a specific function. The modules are connected by magnets to conduct electricity. These modules include batteries, switches, electrical appliances and wires. They can be used to build various circuits, such as series circuits, parallel circuits and other complex circuits. Covering the circuit with interesting cards can turn the circuit into an interesting product toy, such as a flashlight, an electronic cat, or an interesting scene.