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detection OEM fire equipment China fire safety manufacturer advanced R&D fire safety manufacturing case source factory fire equipment industrial fire protection fire safety engineering home fire safety bundle UL smoke detector home se panic button for elderly elderly protection system door sensor alarm aging in place technology RoHS compliant sensor dementia safety device elderly care devices OEM home security sensors automatic water shut off valve senior wellness technology UL listed smoke alarm aging in place supplier Application Scenarios solution digital signage Addressable 2 wire smoke detector 4G LTE Kitchen Safety Gateway kitchen gas valve controller smart kitchen guardian 4G kitchen alarm export kitchen alarm kitchen temperature monitor elderly monitoring system fire protection solution apartment community fire detection China indust ergonomic smoke alarm tester OEM smoke tester EN54 compliant fire detector tester wireless detector tester UL listed heat detector tester smoke 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