【Guide Principle】Based on the interaction between electromagnetic fields and electric charges, a charged ball in a magnetic field is subjected to the Lorentz force, resulting in reciprocating motion, visually demonstrating the fundamental principles of electromagnetism. 【Number Of Balls】Recommended: One, no more than two. Excessive balls will prevent the charging process from completing, resulting in insufficient thrust for the ball to return to the receiving tray. 【Safety Instructions】Power Requirements: DC 12V–24V, Rated Current ≥1A (at 12V); Connector Specifications: 5.5-2.1mm, positive inside and negative outside (reverse connection will cause damage). 【Durability】The bracket and guide rails are made of high-quality materials, resulting in a sturdy and reliable structure that maintains a stable trajectory even after long periods of continuous operation. It is particularly suitable for repetitive experiments and teaching demonstrations, ensuring it looks like new for a long time. 【Wide Applications】Suitable not only for physics demonstrations in middle schools and universities, but also for scientific experiments, electromagnetic research, and robotics development. It is an ideal choice for education, scientific research, and DIY enthusiasts.