Button settings Simple button controls to switch the temperature unit between Celsius and Fahrenheit and adjust settings as needed. Indicator Mini thermometer hygrometer with a level indicator and a clear visual display. Provides immediate humidity and temperature readings, helping you set humidifier, dehumidifier, and humidistat settings. Assists in monitoring your household environment to guard against coldness, dryness of skin, asthma, allergies, and mold. Magnetic Magnetic back allows mounting on metal surfaces such as refrigerators and metal doors. Can be attached and removed easily without tools. Easy to read and use Ready to use out of the box with no complicated setup. White front panel features a clear LCD with large bold numbers for easy reading from a distance. Suitable for placement anywhere in the home or for outdoor use. Powered by a CR2032 battery (included) for long battery life and worry operation.