Development, production, processing, and sales of high-voltage fuses, lightning arresters, high-voltage electrical components, and industrial automation products; sales of low-voltage fuses, automated testing instruments, automated instruments, Wujijiaodian, mechanical and electrical products, wires and cables, daily necessities, chemical raw materials (excluding dangerous, monitoring, and precursor chemicals), rubber products, plastic products, office supplies, labor protection supplies, and fire-fighting equipment.