Outdoor NB-IoT Dual-Door Open/Close Sensor

An outdoor open/close sensor that reports over the NB-IoT cellular network, so it works wherever there is operator coverage — no gateway to install. One unit can monitor two door contacts, which halves the hardware needed for double doors, paired cabinets or a gate and its service door. It raises an alarm when a door is left open and keeps open/close statistics for each input. NARA uses the data for utility cabinets, telecom shelters, pump stations, warehouses and remote sites where access must be logged and unusual activity flagged immediately.