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different from environment temperature, and is affected by both wrist skin temperature and
environment temperature.
Wrist temperature is obtained according to the change of the electrical signal, which is
converted from the amount of temperature by the temperature & humidity sensor.
Wrist temperature is tested automatically on the hour, such as 1:00, 2:00. With a total of 24
times a day.
When the difference between skin temperature and wrist temperature exceeds 4℃, the screen
will flash for 10s, to remind the users to keep warm in cold days.
The most comfortable environment temperature in summer ranges 23-28 °C and in winter
18-25 °C. When environment temperature is above the upper limit of the comfortable
temperature, people feel so warm. When it's above 37°C, people feel too hot. Usually, the
maximum temperature humans can withstand is 52°C. On the contrary, when environment
temperature is under the lower limit of the comfortable temperature, people feel cool and cold.
When it’s under 0°C, people feel freezing.
3. Barometric pressure/Altitude
Barometric pressure is the air pressure per unit area. It is equal to the weight of the vertical
air column extended upward to the aeropause above the unit area.
Altitude is the vertical distance of a location above sea level.
The barometric pressure is measured by barometric pressure sensor. The altitude is calculated
according to the barometric pressure value. The conversion formula between barometric
pressure and altitude is: Altitude (meter) = (1013-Barometric pressure) x 10. There is a small
deviation in the altitude calculated from barometric pressure, because the barometric pressure is
affected by both environment temperature and humidity.
Barometric pressure tests automatically on the hour, such as 1:00, 2:00. Total 24 times a day.
Most comfortable barometric pressure is 1bar, that is, 1013mbar. On the airplane, the cabin is
pressurized, so with the barometric pressure in the range of 700-900mbar, people feel
comfortable.
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