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OEM home security EN14604 smoke alarm ODM fire alarm source factory water flood sensor kitchen safety sensor 4G fire detector home fire export smart home safety gas leak detector home fire alarm PIR motion detector flood water alarm CE certified fire alarm China fire equipment supplier smoke detector wholesale UL smoke detector IoT home safety home fire safety bundle Battery operated smoke alarm fire safety smoke detection fire alarm fire protection smoke alarm fire detector fire sensor photoelectric detector CE approved fire safety equipment addressable detector conventional detector wireless smoke alarm battery smoke detector hardwired detector OEM smoke detector wholesale fire alarm fire detection system smart fire alarm IoT fire safety commercial fire protection industrial smoke detector fire safety exporter fire detection technology fire safety deployment IoT fire monitoring medical facility fire alarm system OEM variant 35 fire detection case CE approved fire safety fire 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