Extra Large Display with Backlight: HD LCD screen displays current temperature and humidity with comfort indicator, maximum and minimum records of the day, clock and calendar. When powered by battery only, simply touch the top to turn on the backlight for 15 seconds. Clear and power-saving, easier to read under backlight. Simple operation button on the back for manual setting or / switching.Home Use Accuracy and Fast Refresh: Temperature range 14.2-158(-9.9-70) with accuracy of 1, humidity range 10%-99% with accuracy of 5%RH. Internal sensors detect changes in temperature and humidity every 10 seconds to provide you with the latest readings. Note: When the temperature is below 14.2 or above 158, LL/HH will be displayed to remind you that the temperature is too low/too high.Clear Indicator and Calibration: Exclusive clear color circle, quickly indicate dry/comfortable/humid air conditions with just one glance. proper humidity, perfect for monitoring the living conditions and health of your family. And it is pre-calibrated to measure temperature and humidity accurately. Calibration function is added if you may need it to display the exact same data as other .2 Power Supply Methods & Brightness Adjustable: This home thermometer can be connected to any USB charger for power. And it can only be powered by 3 x AAA batteries (not included). When powered by the power cord, there are 3 brightness levels to adjust. When powered by batteries only, the brightness cannot be adjusted to extend battery life. You can press the backlight button to light up the display for 15 seconds at a time.Date and Clock Function: Unique design with date and clock, you can easily check the time.Colour:As ShownMaterial:PlasticPackage Contents:1 * Home Weather Monitoring ClockOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.