fire alarm system expansion

smoke alarm with EN approval 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 cellul···