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Photoelectric Smoke Detector For Seniors direct from Wanlin Fire Protection — 12-year factory experience, 4G Smart Smoke Detector (WL-SM600) certified CE/EN54-7/FCC/RoHS. Key specs: 4G Cat.1 wireless, 10s alert push via APP/SMS/call, 3-year lithium. MOQ 200pcs, OEM/ODM available.