gas detector with two stage alarm

serviced apartment gas detector direct from Wanlin Fire Protection — 12-year factory experience, WL-GA204 4G gas detector certified CE/EN50194/UL2075/FCC. Key specs: Catalytic Combustion Sensor + AI False Alarm Algorithm + 4G Cat.1 + Edge Computing + Multi-Sensor Fusion, 4G LTE Cat.1 + AI Cloud Platform + Smart Push + Predictive Maintenance + OTA Update + Va···