Acoustic sound alarms; Alarm sensors; Alarms for the detection of inflammable gases; Burglar alarms; Carbon dioxide detectors; Carbon monoxide detectors; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Electronic-based instruments for measuring environmental parameters including humidity, mold, bacteria, air ...