split spectrum smoke sensor

condo smoke alarm direct from Wanlin Fire Protection — 12-year factory experience, WL-SM604 fully certified CE/EN14604/FCC/RoHS/REACH. Key specs: LoRaWAN (CN470/EU868/US915/AS923) wireless, 10s alert push via APP/SMS/call, 5-year lithium battery, CE/EN14604/FCC certified. MOQ 200pcs, 20-25 working days, OEM/ODM custom branding available. Serving 60+ countri···