Features: Discover the principles of electricity and electromagnetism with our Adjustable Electric Bell Relays Electricity Experiment Components, used for illustrating complex concept in simple and engaging way. Featuring adjustable setting and ABS construction with copper wire, this physics teaching tool allows for easy observation of different relays states, ensuring long term educational use. Very suitable for physics teachers, educational training centers, electronics engineering students, and hobbyists who seeks hands on learning experience. Widely used for school labs, laboratory demonstrations, science exhibitions, and classroom teaching or research project. Enhancing your understanding of electrical circuits and relays mechanisms with this essential educational device, must have for any comprehensive physics teaching toolkit. Specifications: Color: Greem Component: ABS; Metal Size: Approx. 10.5x8cm/4.13x3.15in Weight: Approx. 50g Package Includes: 1Piece Electric Bell Relays note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color