NB IoT fire alarm audio indicator

wireless sounder strobe with alarm maintenance direct from Wanlin Fire Protection — 12-year factory experience, WL-SS103 fully certified EN 54-3/UL 464/UL 1971/CE/FCC/RoHS/REACH. Key specs: NB-IoT (LTE Cat-NB1), Ultra-Bright Xenon Strobe + Piezoelectric Sounder, 5-year replaceable battery (2x D lithium). MOQ 100 units, 25-30 working days, OEM/ODM custom bran···