5.8 inch Large LCD Display with Backlight: 5.8 inch HD LCD display to show current temperature and humidity with comfort display, max and min records in one day, clock and calendar. A simple press on the top will turn on the backlight for 15 seconds if the device is powered by batteries only. Clear and energy-saving, easier to read when the backlight is on. Simple control buttons on the back for manual setting or F/C switchingAccuracy for Home Use & Fast Update: Temperature range from 14.2~158(-9.9~70) with 1 accuracy and humidity range from 10% to 99% with 5%RH accuracy. The indoor sensor detects temperature and humidity changes every 10 seconds and provides you with the latest readings. Note: When the temperature is lower than 14.2F or higher than 158F, the LLF/HHF will be displayed to remind you that the temperature is too low/too highClear Air Comfort Display & Calibration: Exclusive clear color circle for quick display of dry/comfort/humid air status at a glance. Ensures good humidity and is ideal for monitoring family living conditions and health. And it has been pre-calibrated for accurate temperature and humidity measurement. If you want to display exactly the same data from other brands, the calibration function is added