Description Feature: 1. WORKING PRINCIPLE: Electromagnet generates magnetism when energized, sucks the armature, makes the moving and static contacts contact, and works by using the magnetic effect of electric current. 2. WITH BASE: Physical acoustic experiment with base, make the experiment demonstration more intuitive, easier for students to observe the state of each part and learning. 3. GOOD TEACHING TOOLS: Electrical bell science experiments teaching tools are good teaching tools for teaching physics, enhancing childrens hands on ability and fun. 4. USAGE: Vertical physical acoustic experiment is very suitable for teachers to explain the current magnetic effect related physical knowledge. 5. DURABLE MATERIAL: Electrical bell science experiments are made of plastic and copper, not easy to be damaged, durable and can be used for a long time. Specification: Item Type: Electrical Bell Science Experiments Vertical Material: Plastic, Copper Working Voltage: DC 3-6V Usage: Ideal for Teachers to Explain the Magnetic Effect of Electric Current Related to Physical Knowledge. Package List: 1 x Electrical Bell Science Experiments Vertical