ABOUT THIS ITEM: 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. The Wireless Thermometer console includes audible and visual alarms when temperature exceeds your pre-set minimum and maximum alarm settings. 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. Multiple Installation 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. 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. Features: -The LCD screen with large digit, easy to read, at-a-gloss thermometer. -Displays indoor/outdoor temperature, MAX/MIN records, and temperature trend indicator arrow. -Equipped with 2-sensor transmitters, convenient to place on different shelves. -Set the Max/Min alarm value manually, warn you by buzzer. -Compact and delicate design, suitable for home, restaurant, cafes, etc. Note: -Don't disassemble the product freely. -While the indication is blurring, please change the battery. -Do not put this product in the place where it is hot, humid, dusty or full of corrosive gas, in case that its electronic components are damaged. -It will not alarm at once when temperature exceeds pre-set. It will compare the temperature after 10 minutes. And when temperature reaches alarm value, the thermometer will alarm immediately. Package Included: 1 x Main Unit 2 x Transmitters 1 x User Manual