4. EASY TO INSTALL AND USE Use the magnet on the back to attach the thermometer directly to your fridge or freezer, or place it on a table. 3. Alarm Settings When the indoor or outdoor temperature exceeds the preset minimum and maximum values, the thermometer emits an audible alarm and visual alarm to alert you and see if adjustments are required. 1. Interference-free wireless signal transmission of 100 meters, can display two different maximum and minimum temperature recordings at the same time. 2. ℃/˚F Unit Conversion: The display Celsius and Fahrenheit can be changed to meet daily needs and has strong signal penetration. 5. Application Can be used in refrigerator, freezer or indoor and outdoor to easily monitor temperature changes and provide double protection for food.