2.℃/˚F unit conversion: Celsius and Fahrenheit display can be switched to meet and has strong signal penetration. 1.Wireless signal transmission distance without interference 100 meters, can display two different maximum and minimum temperature records at the same time. 3.ALARM SETTINGS: When the indoor or outdoor temperature exceeds the preset minimum and maximum alarm values, the thermometer emit an audible alarm and a visual alarm to alert you and allow you to see if adjustments are 4.EASY TO INSTALL AND OPERATE: Use the magnet on the back to magnetically attach the thermometer directly to your refrigerator or freezer, or place it on a table. 5.APPLICATION: Can be used in the refrigerator, freezer or indoors and outdoors to easily monitor temperature changes and provide double protection for your food.