Description: An excellent electronic kit suitable for high school students through a number of experiments can enhance the knowledge learned from physics classes, which is easy enough for junior high school students and children. Needless to say, our product can train students' hands-on ability because it is easy to operate and assembly. It can emit a continuous bell while working with the principle of electromagnet is used. It is made from electronic component and plastic, is durable to use. There is one size of the product to choose from. This product is suitable for education. Item Name: Electrical Trembler Bell Model Material: Plastic,Electronic Component Features: Practical Ability, Sturdy, Stable Current Battery: 2 x AA Batteries (not Included) Size Details: Electric Bell Model Size: 11cm x 7cm/4.33" x 2.76" (Approx.) Battery Box Size: 8cm x 2cm/3.15" x 0.79" (Approx.) Single Pole Switch Size: 4cm x 7.5cm/1.57" x 2.95" (Approx.) Lead Length: 20cm/7.87"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Electric Bell Model 2 X Battery Box 1 X Single Switch 4 X Wires