When the outdoor temperature is greater than 80°F (26.7°C), the value of
Feels Like is the heat index.
Users can choose whether to display Feels Like Temperature or Apparent
Temperature on the App: Open Ecowitt App – Menu – Setting – Temp
Index.
3.3.13 LCD Display Brightness
The WS3900/WS3910 has 5 levels of brightness, which are Max -> High
-> Medium -> Low -> Off.
3.3.13.1 When Battery Powered:
When the battery power is supplied, pressing any button will turn on the
backlight, and the backlight will turn off automatically after 15s without
button operation. When only battery powered, the backlight is only
"Medium " and "Off".
Note: Run on 3 x AA battery power alone for only about 24 hours.
3.3.13.2 When DC Powered:
1. The backlight will be adjusted to "Medium" automatically when DC
power supply is just connected.
2. After disconnecting the DC power supply, the backlight will keep the
brightness for 15s and then turn off.
3. When DC power is supplied, press LIGHT briefly to adjust the
backlight: Max -> High -> Medium -> Low -> Off.
3.3.14 DATE and CO2 Display switching
1. When the device accesses to power supply, it will first show DATE
and sunrise and sunset time for about 20S (search the sensors), and then
switch to show CO2 and solar&UVI.
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