Features: Experience dramatic 10cm artificial arcs wirelessly with this handheld coil, powered by 18650 batteries (16.8V, 2900mAh) for up to 30,000 arcs per charge—no wires or grounding required. Features control panel for precise adjustments to arcs length (up to 10cm), frequency (1-10Hz). Designed for STEM educators, science enthusiasts, and hobbyists seeking interactive demonstrations of electromagnetic principles, physics, or immersive displays. Ideal for classroom experiments, science exhibits, electronics projects, or creating visual effects at themed event and technology showcases. Built with smart safety protocols—auto shutdown at low voltages (≤12V) or overheating (≥70°C)—and a lightweight ergonomic design ensures portable operate for endless scientific exploration. Specifications: Supply voltages: 12-16.8v Battery: 4s 18650 16.8V Capacity: 2900mah/48wh Arcs length: Adjustable, 10cm at most Host size: about. 280x165mm/11.02x6.5in Package Includes: 1 Set Arcs Generator note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.