smart fire grassroots fire force construction

smart fire IoT hardware OTA upgrade direct from Wanlin — 12-year Chinese smart fire IoT manufacturer, WL-SFP200 certified UL 217/UL 268/UL 2034/UL 864/CE/EN14604/EN54/FCC. Key specs: Photoelectric Smoke Sensor + Electrochemical CO Sensor + NB-IoT + Multi-Sensor Fusion, NB-IoT + IoT Cloud Platform + Dual Alarm (Smoke + CO) + SMS/Push/Email. Complete smart fi···