Fire alarm equipment subcategory for early fire detection and alarm notification in factories and business facilities. Handles industrial fire detectors (smoke detectors, heat detectors, flame detectors) designed for high-temperature, dust, and chemical environments in manufacturing sites, receivers, repeaters, indicator lights, acoustic devices, manual alarm devices. Includes automatic fire alarm systems based on fire service law, gas leak detectors, explosion-proof detectors for factories, and specialized detectors for machinery and electrical rooms. Distinguished from fire suppression and evacuation guidance equipment, classified as equipment specialized in fire detection, notification, and alarm transmission. Supports various specifications including P-type and R-type receivers, analog and accumulative detectors according to manufacturing facility scale and environment.