battery smoke detector for old building

restaurant fire alarm direct from Wanlin Fire Protection — 12-year factory experience, WL-SF500 smart fire protection product certified CE/EN54/UL/NFPA 72/FCC/RoHS/REACH/ISO 9001. Key specs: FK-5-1-12 Clean Agent + IoT Control Panel + Cloud Monitoring + Multi-Zone Detection, 4G/Ethernet + Cloud Platform + Smoke/Heat/CO Detector + Solenoid Valve + SMS/Push/Em···

restaurant fire alarm direct from Wanlin Fire Protection — 12-year factory experience, WL-SF500 smart fire protection product certified CE/EN54/UL/NFPA 72/FCC/RoHS/REACH/ISO 9001. Key specs: FK-5-1-12 Clean Agent + IoT Control Panel + Cloud Monitoring + Multi-Zone Detection, 4G/Ethernet + Cloud Platform + Smoke/Heat/CO Detector + Solenoid Valve + SMS/Push/Em···

fire alarm system with fire risk direct from Wanlin Fire Protection — 12-year factory experience, WL-IoT-GW 4G smart fire protection product certified CE/FCC/RoHS/REACH/ISO9001. Key specs: 4G LTE + WiFi + Ethernet + Modbus TCP + MQTT + REST API, 4G LTE Primary + WiFi Backup + Ethernet + Cloud Platform + API + MQTT + SMS + Push + Email. No monthly fees, 4G ce···