Features: Dives into the world of electronics with our aa battery holder, essential tool for educational physics experiments that demonstrates the principles of series and circuits. Learning more about science technology and physics experiments by our battery storage box. Suitable for middle school and high school physics students, university engineering majors, and anyone on exploring electrical experiments and circuitry concepts. Suitable for use in physics classrooms and academic exhibition, this battery holder facilitates engaging demonstrations and hands on learning experiences. This battery holder is suitable for flexibility in building various configurations, allowing users to firsthands the effects of circuit connection on voltages and current. Specifications: Component: Plastic Size: about 8x2x1.7cm/3.15x0.79x0.67'' Package Includes: 6 Pcs/Set Battery Case note: Please allow 1-3cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item.