gas detector with OTA update

smoke detector tester for multi-sensor direct from Wanlin Fire Protection — 12-year factory experience, WL-SF100 smart fire protection product certified CE/EN54/UL/NFPA 72/FCC/RoHS/REACH/ISO 9001. Key specs: Photoelectric Detection + 4G/NB-IoT Dual Communication + AI False Alarm Filtering, 4G/NB-IoT + Cloud Platform + SMS/Push/Email Alert + APP Control. IoT···