Wireless Sensors Compatible with Various Locations - With a built-in console and 2 external sensors, you can place sensors in the refrigerator or outdoors. The wireless refrigerator thermometer can simultaneously display the indoor temperature and 2 groups of fridge/freezer or outdoor temperatures, meaning the screen shows 3 temperatures at the same time. Audible Alarm Function - Equipped with an audible alarm, when the temperature exceeds the compatible preset minimum and maximum alarm value, the thermometer will emit an alarm compatible to remind you and your family to be aware of temperature variations and make certain changes in time. 3.6-inch HD Large Screen and Min/Max Recording - Indoor/outdoor thermometer compatible with HD LCD screen. Large data size compatible with convenient viewing day and night. Record and display max/min temperature. Indoor: -10-60°C; Outdoor: -40-60°C; Transmission Range: 30M / 98.4ft (open area). Press the \"℃/℉\" button compatible to switch to Fahrenheit or Celsius. Battery Powered and Intimate Service - The main unit requires 2*AAA (not included), 9.5*8*2cm; Each sensor 2*AAA (not included), 10.5*3.5*1.5cm. Easy Installation and Simple Operation - You can place the sensor in the refrigerator or outdoors. On the main unit, there is a hole compatible for hanging and a stand on the back, you can hang it on the wall or stand it on the table.