NB IoT alarm with low battery indicator

4G alarm with cloud monitoring direct from Wanlin Fire Protection — 12-year factory experience, WL-SS108 fully certified EN 54-3/UL 464/UL 1971/CE/FCC/RoHS/REACH. Key specs: 4G LTE Cat.4 + WiFi 6 + Matter + Thread, Premium Xenon + Multi-Tone Sounder + LCD Display, AC powered + 72h backup battery. MOQ 100 units, 25-30 working days, OEM/ODM custom branding av···