Jeanoko Experiment Electric Bell Clear Sound Physics Teaching Tool for Classroom, 4-6V DC Power Supply, 15M Range Sound, Applicable for Laboratory

["[BETTER LEARNING] Understand DC electric bells & air sound transmission. Perfect for physics demonstrations in classrooms.","[SIMPLE OPERATION] Connect to 4-6V DC power supply for easy use. Bell will sound when powered.","[SOUND DEMONSTRATION] Clear ringing within 15M range for effective teaching.","[EASY MAINTENANCE] Adjust contact screw and shrapnel distance for optimal performance.","[DURABLE & SAFE] Made with ABS material. Follow storing instructions for long-lasting use."]