The US CDC reports that each year, there are about 36 million falls among adults ages 65+, and 37% of those falls result in an injury that requiresmedical treatment. After a fall, prompt medical treatment is crucial. The "Golden Hour" is a medical phrase used to describe the first hour after an emergency event, when treatment is said to be most likely to save theindividual. A detecting device like contactless mmWave detecting sensor or mobile PERS device such as GPS tracker with SOS button enables users to quickly reachspecialists, saving critical minutes after a fall or other emergency.When detecting a fall, they quickly send the notification to the caregiver and the relatives.According to the New England Journal of Medicine, "For elderly people who live alone, becoming incapacitated and unable to get help is a common event,which usually marks the end of their ability to live independently.”

In normal state, the radar will accurately judge the human body's sedentary state and the existence of sleep, and output information such as falls, breathing, and vital signs.1. The radar scanning area is large, and the movement of the doorway and the next door of the wooden wall is detected.    Adjustment method: reduce the radar sensitivity, and the radar provides scene settings.2. The underside of the radar is facing the running air conditioner and fan.    Adjustment method: Adjust the radar position, do not directly face the air conditioner or fan.3. Object shaking caused by air-conditioning wind.    Adjustment method: cotton, non-metallic items will not cause false alarms. Metal items need to be secured.4. The radar is not fixed, and the vibration causes false alarms.    Adjustment method: Avoid support shaking and vibration.5. Occasional moving objects such as pets and birds.    Adjustment method: Since the radar measures fretting and has high sensitivity, this interference cannot be ruled out.6. Power supply interference, resulting in occasional misjudgment.    Adjustment method: try to keep the power supply current stable and reduce the ripple.

Radar transmits and receives electromagnetic waves to determine the presence of a human body. The closer you are to the radar, the higher the accuracy.1. The human body is outside the radar range.    Please refer to the radar scanning range, and adjust the installation angle; the radar measurement range, in different environments, the electromagnetic wave    reflection area is different, and the scanning area will be slightly different.2. Metal occlusion causes wrong output.    Too thick office chairs and metal seats will block the penetration of electromagnetic waves and cause misjudgment.3. Difference in scanning angle.    The radar did not scan the torso, resulting in a misjudgment.4. Radar sensitivity is too low.    Radar provides parameter adjustment to increase sensitivity improvement.

Attentions:1) Interference factors: The technology belongs to electromagnetic wave detection sensors, and active non-living objects will cause false alarms. The movement of metals and liquids (not penetrated) will cause misjudgments. Usually, electric fans, pets or birds close to the detection range occasionally move, and the shaking of metal curtains will cause misjudgment. These interference items cannot be ruled out, and you need to plan or adjust the installation location. In addition, it needs to be fixedly installed, and vibration and shaking will cause false alarms. 2) Non-interference factors: Electromagnetic wave scanning will penetrate human clothes, curtains, thin wood panels, gypsum partition walls, glass and other low-density objects. It is necessary to consider the installation location according to the detection range of the application scenario. 3) Semi-interference factor: It is not suitable to directly face the air conditioner if it is judged that the human presence exists. The internal motor of the air conditioner can cause misjudgment. It is required that the product does not directly face the air conditioner or is in the same direction as the air conditioner. Advise to install it at least 1.5m far away from air conditioner or outdoor air. Also assure that it is at least 0.5m away from exhaust fan.