Plug-in type sensors for measuring air quality; plug-in type sensors for harmful gas measurement; plug-in type sensors to detect movement of companion animal; plug-in type sensors for detecting human body movement; plug-in type sensors for tracking people's movements; plug-in type sensors with a light source that indicates the air quality; plug-in type sensors for measuring discomfort index; plug-in type sensors for monitoring the movement of the elderly; plug-in type sensors that outputs an alarm signal by analyzing the motion detection of people or companion animals, air quality, temperature and humidity, and harmful gas detection; plug-in type sensors that analyzes the motion detection of people or companion animals, air quality, temperature and humidity, and harmful gas detection, and sends alarms to hospitals and fire stations to notify emergency situations; computer application software for transmitting motion detection of people or companion animals, air quality, temperature and humidity, and harmful gas analysis information to pre-registered terminals; computer application software for analyzing motion detection of people or companion animals, air quality, temperature and humidity, and harmful gas detection; computer application software for mapping and displaying analysis information on a map of the house by analyzing motion detection of people or companion animals, air quality, temperature and humidity, and harmful gas detection within the house; computer application software that analyzes the user's movement within the space by collecting information on the density of the user's movement by time and space; computer application software that collects air quality change information by space, time, and season and analyzes harmful gas information that is introduced or generated into the home; computer application software that collects temperature and humidity information by space in real time and analyzes it by season and time; gas sensors; motion sensors; software for transmitting, receiving, and analyzing data collected from gas sensors and motion sensors