1.【Temperature Range】The indoor/outdoor thermometer range: Indoor -10℃~ 60℃ (14℉~ 140℉), Outdoor -40℃~ 60℃ (-40℉~140℉) and the transmission range is 100M/328ft(open area). You can use it in the fridge, freezer or outdoor, which provides safe food storage. 3.【Audio Alarm】The Wireless Thermometer console includes audible and visual alarms when temperature exceed your pre-set minimum and maximum alarm settings. 3.【Easy to Read Display】The LCD screen with large digit.Records Min and Max temperature provides the historical temperatures readings. With this feature, you can easily monitor the temperature change of your refrigerator and provide double protection to your food safety. 4.【Multiple Installtion Ways】The wireless thermometer is easy to install. The display unit can stand on the table, hang on the wall, magnet on the refrigerator. The wireless sensor can clip on door or hang on the wall. 5.【Operate Easily】There are 6 function keys on the main unit and signal indicator on the transmitter, you just press the corresponding key to turn on/off the alarm, switch the Celsius or Fahrenheit and clear the MAX/MIN records.