mobile app fire alarm control

fire alarm troubleshooting — Wanlin, 12-year Chinese smart fire protection manufacturer, WL-SFP200 (Smart Smoke and CO Combination Detector) certified UL/FM/CE/EN54/NFPA 72. Photoelectric + Electrochemical CO + NB-IoT + Multi-Sensor. OEM/ODM from 500 units, factory direct pricing 50-70% below Western brands, 60+ countries.