historic building fire protection

smart fire door monitoring direct from Wanlin - 12-year factory experience, WL-SFP200 smart fire detector certified UL 217/UL 268/UL 2034/UL 864/CE/EN14604/EN54/FCC. Key specs: Photoelectric Smoke + Electrochemical CO Sensor + NB-IoT + Multi-Sensor Fusion, NB-IoT + IoT Cloud Platform + Dual Alarm (Smoke + CO) + SMS/Push/Email. Smart fire IoT cloud platform w···