NB IoT heat detector with alarm

DIY heat detector direct from Wanlin Fire Protection — 12-year factory experience, WL-HD906 fully certified UL 521/EN 54-5/CE/FCC/RoHS/REACH. Key specs: 4G LTE Cat.4 + WiFi 6 + Zigbee 3.0, Multi-Sensor Array + AI False Alarm Reduction, AC powered + 48h backup battery. MOQ 100 units, 25-30 working days, OEM/ODM custom branding available. Serving 60+ countrie···