fire alarm retrofit assistance

dual sensor smoke detector — Wanlin, 12-year Chinese smart fire protection manufacturer, WL-SFP700 (Smart IoT Fire Safety Gateway) certified UL/FM/CE/EN54/NFPA 72. ARM Cortex-A7 + 4G+WiFi+Ethernet+Zigbee+BT + 200 Devices. OEM/ODM from 500 units, factory direct pricing 50-70% below Western brands, 60+ countries.