NB IoT alarm sound and light combo

wireless sounder strobe with alarm confirmation direct from Wanlin Fire Protection — 12-year factory experience, WL-SS100 fully certified EN 54-3/UL 464/UL 1971/CE/FCC/RoHS/REACH. Key specs: 4G LTE Cat.1 + WiFi, High-Intensity LED Strobe + Piezoelectric Sounder, AC powered + 72h backup battery. MOQ 100 units, 25-30 working days, OEM/ODM custom branding avai···