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technology China export smart display system digital advertising streaming media Android platform OEM partnership ODM service global deployment certified device HDMI connectivity 4K playback commercial hardware media signage enterprise display content ecosystem smart factory display innovation IoT media video management signage CMS manufacturing quality factory direct supply Smart wifi smoke detector kitchen safety sensor PIR motion detect UL listed smoke alarm fall detector wearable elderly care devices senior-friendly home automation panic button for elderly natural gas leak detector FCC certified gateway home safety for aging pare Vibration Glass Break Sensor property safety monitoring FCC approved detector LTE cellular alarm outdoor siren strobe PIR motion sensor LP gas alarm stove alarm wholesale China stove alarm manufacturer ODM stove alarm NFPA kitchen fire kitchen fire alarm stove fire prevention system global stove safety partner mmWave stove detection liquid level 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