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alarm mmWave radar kitchen sensor kitchen smoke detector stove auto shut-off EN54 certified school building fire alarm deployment case certified fire d Gas Stove Automatic Cut-Off Device senior stove monitor kitchen fir healthcare fire protection solution case I FCC certified gateway gas stov Alarm System for Apartment LP gas alarm panic button pendant medical alert pendant Certification & OEM solution ROHS compliant Android TV stick 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 content ecosystem smart factory display innovation IoT media video management signage CMS manufacturing quality factory direct supply fire safety exporter guest room fire detection case study fire dete pipeline pressure monitoring wireless sensor industrial pressure sensor digital pressure gauge Compressed Air Pipeline Wireless 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