LCD screen display: large LED display that shows the current temperature and humidity in the room and the trend. Oria thermometer is equipped with a blue illuminated LCD display. With this LCD screen, temperature and humidity can be clearly read at night. Touch screen and button functions: there are 3 function keys: C/F switch, backlight button, all time/24 hours button. With the "/" button, you can change the temperature display. With the "Lights" button, you can read the temperature/humidity at night more conveniently. With the "All Time/24 hrs" button, you can set the temperature or display the temperature/humidity of the last 24 hours. Max and min display-- The device updates the data every 10 seconds and records the highest and lowest temperature/humidity within 24 hours. With this function, you can predict the trend of weather status. Press and hold the "All Time/24HRs" button for 3-5 seconds to clear the recording of the maximum/minimum temperature/humidity. Wide temperature range and comfort zones: the digital thermometer provides precise measurement and a wide measuring range. (Temperature range: -20 to 70 (-4 to 158)/Humidity range: 20% to 95%). Thermometers also offer three comfort zones - dry, comfortable, wet. This would be more intuitive for you to understand the humidity. Installation method: lightweight and beautiful design, powered by 2 x AAA batteries (not included). The thermometer can be attached anywhere in the house by hanging holes/magnets or table base, which is convenient to use.