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signage content ecosystem smart factory display innovation IoT media video management signage CMS manufacturing quality factory direct supply Alarm System for Apartment LP gas alarm medical alert pendant fire safety exporter guest room fire detection case study fire dete Accessories solution TV stick voice remote control Leak Detection System UL listed detector flood detection system RoHS compliant smart home security LTE cellular alarm senior safety alarm Application Scenarios solution TV stick Wireless Range Extender outdoor siren strobe elderly fall detection river water level monitoring IP68 waterproof level sensor continuous level measurement wastewater level sensor hydrostatic level gauge submersible level transmitter well water level sensor ultrasonic level sensor RTU level acquisition LoRa level sensor ATEX explosion-proof level sensor sewage level monitor level auto control reservoir water level measurement IoT level monitoring flood prevention level sensor 4-20mA level 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