4G Smoke Alarm

China Fire Smoke Sensor Supplier Spotlight: Wanlin WL-SM500 ··· China Fire Smoke Senso··· 2026-05-31
Fire Smoke Sensor direct from Wanlin Fire Protection — 12-year factory experience, WL-SM500 fully certified CE/EN54/FCC/RoHS. Key specs: NB-IoT ultra-low-power, 8-year battery life, daily heartbeat re