Multiple Data Display: Thermometer hygrometer with temperature and humidity calibration function to account for any differences in the system. Simultaneously displays time, calendar, week, indoor and outdoor humidity, temperature, temperature and humidity trends, comfort level, and records the highest and lowest temperature and humidity. Backlight and Alarm Functions: Features backlight off, backlight on (white), upper limit alarm, and lower limit alarm. Automatically shuts off after approximately 8 seconds to clear the screen in the dark and conserve power. 12H/24H and ℃/℉ Switchable: Switch between 12-hour and 24-hour formats. Change the temperature display between ℃ and ℉. View past maximum and minimum temperature and humidity readings. Access and delete recorded data as needed. Wide Applications: Suitable for indoor and outdoor use in bedrooms, baby rooms, offices, greenhouses, wine cellars, warehouses, and more. Wireless design with desktop and wall-mount options. Battery not included.