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gas leak alarm systems having voice activated audio speaker and lighting apparatus; gas leak alarm systems having emergency lights for power failure and night lights; centralized monitoring alarm systems for multiple gas leak alarms installed separately and their parts and accessories; centralized monitoring alarm systems for multiple gas leak alarms installed separately, having voice activated audio speakers; centralized monitoring alarm systems for multiple gas leak alarms installed separately, having voice activated lighting apparatus; centralized monitoring alarm systems for multiple gas leak alarms installed separately, having voice activated audio speakers and lighting apparatus; centralized monitoring alarm systems for multiple gas leak alarms installed separately, having voice activated emergency lights for power failure and night lights; centralized gas monitoring alarm systems having gas circuit breaker and ventilator, and their parts and accessories; centralized gas monitoring alarm systems having telecommunication functions and parts and accessories therefor; 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application software for smartphones, tablet computers and computers, for displaying and transmitting information sent from gas alarms, gas leak alarms, carbon monoxide alarms, fire alarms and incomplete combustion alarms and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling gas alarms, gas leak alarms, carbon monoxide alarms, fire alarms and incomplete combustion alarms; application software for smartphones, tablet computers and computers, for displaying and transmitting information sent from fire alarms, air pollution indicator alarms, gas leak detectors, fire detectors, heat detectors and gas detection alarms and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling fire alarms, air pollution indicator alarms, gas leak detectors, fire detectors, heat detectors and gas detection alarms; application software for smartphones, tablet computers and computers, for displaying and transmitting information sent from gas alarming devices and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling gas alarming devices; application software for smartphones, tablet computers and computers, for displaying and transmitting information sent from monitoring alarm systems for personal security, home security and natural disaster prevention and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling monitoring alarm systems for personal security, home security and natural disaster prevention; application software for smartphones, tablet computers and computers, for displaying and transmitting information regarding abnormality of indoor environment and inhabitant sent from personal security and home security alarm systems and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling personal security and home security alarm systems for detecting and warning abnormality of indoor environment and inhabitant; application software for smartphones, tablet computers and computers, for displaying and transmitting information sent from personal security, home security and natural disaster alarm systems and for sending warning information; application software for smartphones, tablet computers and computers, for setting up, managing and controlling personal security, home security and natural disaster alarm systems;