Audio-receivers and video-receivers; Carbon dioxide detectors; Carbon monoxide detectors; Combustible gas concentration detectors; Decorative covers for smoke detectors; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Electromagnetic measuring detectors; Electronic apparatus, namely, motion detectors; Fire and smoke detectors; Fire detectors; Gamma scintillation detectors; Gas detectors for detectin...