1 AAA batteries required. (included)

【Air Comfort Indicator】Humidity meter with humidity level icon indicates air condition — DRY/COMFORT/WET, allowing this humidity sensor to ensure you’re always aware of changes to your home/household with just a quick glance
【High Accuracy and Quickly Refresh】Inside thermometer has high accuracy of ±2~3%RH and ±1°F, making it ideal for measuring fluctuating readings like in a greenhouse; Data measurements are updated every 10 seconds to give you lastest changes of the environment!
【High & Low Records】Accurate hygrometer digital thermometer displays high and low temperature & humidity, always get ready to the changes of the environment!