1. Indoor/outdoor temperature, indoor humidity display
2. degrees Celsius/Fahrenheit temperature switching display
3. Highest/lowest temperature humidity function
4. Frost point alarm function [-1 degrees Celsius???+4 degrees Celsius (+30.2 Fahrenheit???+39.2 Fahrenheit)]
5. Comfort display
6. Comfort range: When the indoor temperature is between 20 degrees Celsius ~ 25 degrees Celsius (68 Fahrenheit ~ 77 Fahrenheit) and the indoor humidity is 40% RH ~ 70% RH; when the humidity range is greater than 70% RH, the humidity range is less than 40% RH When:
7. When the temperature is greater than 25 degrees Celsius (77 Fahrenheit) or less than 20 degrees Celsius (68 Fahrenheit) and the humidity is between 40% RH and 70% RH, no picture is displayed.
8. Size:70 x 81 x 20 mm
9. Battery:1 x 1.5V battery (AA) (not included)
10. Package contents:Thermometer Digital LCD Hygrometer/User Manual (English)

Method of operation
1. Open the battery cover, remove the battery, and replace the positive and negative poles (positive side up) to replace the battery and the battery cover. The machine can be used.
2. Button function:
[MAX/MIN] shows the maximum (MAX)/minimum (MIN) memory value of indoor temperature and humidity and outdoor temperature;
[degrees Celsius/Fahrenheit] switching temperature unit is displayed in (degrees Celsius) or (Fahrenheit);
[CLEAR] clears the maximum/minimum memory value;
[FREEZE ALT] frost point alarm switch;
3. Press the [FREEZE ALT] button for 2 seconds to turn on the (with) / off (none) frost point alarm function.
4. Press the [MAX/MIN] key. When MAX appears on the screen, press [CLEAR] once to clear the maximum value; press [MAX/MIN], when the MIN appears on the screen, press [CLEAR] once. Clear the minimum value.