Hygrometer displays high/low for temperature and humidity in Fahrenheit or Celsius on large touchscreen display. Install quick-connect bracket on interior door or wall of safe or vault room, or use fold-out stand. Indoor thermometer and humidity sensor for safes and vault rooms. Displays high/low for both temperature and humidity in either Fahrenheit or Celsius. Large touchscreen display. Install the quick-connect bracket on interior door or wall to save shelf space and allow easy viewing and retrieval. Includes fold-out stand for convenient storage on shelf or floor of safe. Powered by two AAA batteries (not included).