DIY Electromagnetic Inductance Coil Scientific Electromagnetic Experimen Kit

Features: With high-quality triodes, the triode will be less heated, charging speed is much faster, 20-30 seconds or so can be filled,no need for rest after launch, then charge. The product is simple and beautiful. There is no spider web style. The production is relatively simple and the success rate is relatively high. Power supply voltage: 4.5V (3 Section 7 battery)( Battery not included ) Range: 6-8 M Package Included: 1 x DIY Electromagnetic Inductance Coil Kit