2. Audio Alarm: The wireless freezer thermometer alarm console includes Audible and visual alarms when the temperature exceeds the preset minimum and maximum alarm values. After setting the alarm temperature, short pressing the alarm button on the screen will show an "alarm" icon and the alarm function set will be activated by default. 1. The indoor outdoor wireless refrigerator thermometer has a temperature range of -10℃ to 60℃ (14℉ to 140℉) for indoor and -40℃ to 60℃(-40℉ to 140℉) for outdoor and a transmission range of 100m(328℉) feet) (open area). You can use it in the refrigerator, freezer or outdoors, allowing you to store food safely. 3. EASY READ DISPLAY - The freezer thermometer has an LCD display with large digits. Records minimum and maximum temperature and provides historical temperature. With this function, you can easily monitor the temperature changes of your refrigerator and provide double protection to food safety. 4. Multiple Installation Ways The wireless thermometer with alarm is easy to install. The display unit can be placed on a table, hung on the wall or attached with a magnet to the refrigerator. The wireless sensor can be placed on the door or hung on the wall. Note: Do not place this product in a warm, damp, dusty or corrosive gas filled place, as electronic components may be damaged.