Source Photoelectric Smoke Detector directly from Wanlin Fire, a leading Chinese manufacturer of 3-in-1 Smoke Heat CO Detector. Product highlights: Smoke+Heat+CO tri-sensor, multi-gas detection, EN54-
Composite Smoke Detector 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 heart