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distributor Water Leak Sensor PIR motion sensor smart kitchen safety China stove al reservoir water level measurement factory direct level gauge remote level measurement chemical tank level sensor RoHS compliant level transmitter IP68 waterproof level sensor river water level monitoring float lev stove CLP Regulation smoke spray label small order smoke tester East Asia distributor China elderly care manufacturer senior safety technology elderly monitoring s tank overflow prevention hydrostatic level gauge high temperatu ODM fire safety solution development fire dete smoke test for wind turbine UL listed heat test equipment Southeast Asia distributor Photoelectric smoke detector Advertising Media Player solution advertising media player Wanlin 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 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