underground passage smoke detector

resettlement housing fire alarm direct from Wanlin Fire Protection — 12-year factory experience, WL-SFP800 smart fire detector certified CE/EN14604/EN54/UL217/UL268/FCC/QCVN. Key specs: Photoelectric Smoke Sensing + RF Wireless Interconnect (433MHz/868MHz) + Mesh Network + Self-Healing Topology, RF Wireless Mesh + 4G LTE Cat.1 Gateway + Cloud Platform + SMS···