Wireless Digital Refrigerator Freezer Thermometer Temp Alarm 2 Sensor In/Outdoor Feature: There are 6 function keys on the main unit and the signal indicator on the transmitter. Just press the corresponding button to turn the alarm on/off, switch Celsius or Fahrenheit, and clear the MAX / MIN record. Max/Min Record: The Freezer Thermometer can record max/min temperature and display up, down & parallel arrow to indicate the trend of current temperature. Press "℃/℉" key for switching Fahrenheit or Celsius. Audio Alarm Reminding: With indoor and outdoor audible alarm. When temperature exceed your pre-set minimum and maximum alarm setting, it will make a sound alert. 24H Record: Includes 24 hours Min and Max temperature records and you can easily monitor the temperature change of your refrigerator and provide double protection to your food safety. Dual Wireless Sensor:Comes with a Thermometer and 2 remote sensors, the wireless fridge thermometer can display indoor temperature and 2 groups of fridge /freezer or outdoor temperature simultaneously. Easy to install and operation: Mount display unit directly to your refrigerator or freezer using integrated magnets or hang on wall using keyhole, and The wireless sensor can clip on door or hang on the wall. It can be used in the freezer and act as thermometer indoor and outdoor. LCD Display: With easy-to-read LCD display to show the current indoor and outdoor temperature. Temperature range: Indoor -10℃~ 60℃ (14℉~ 140℉), Outdoor -40℃~ 60℃ (-40℉~140℉) and the transmission range is 100M/328ft(open area). Battery Power: The Digital Thermometer powered with 2*AAA battery(Not included).The sensor powered by 2*AA battery(Not included). Specification: Item Type:Thermometer Clock Material: Plastic Color: White Indoor temperature range: -10 ° C ~ +60 ° C. Outdoor temperature range: -40 ° C ~ +60 ° C. Accurate temperature: +/-1.0 Package Size:11.5*9.5*6.5cm/approx. 4.5*3.7*2.5 inch Note: Press INDOOR ALARM or OUTDOOOR ALARM key for 3 seconds to enter into SENSOR temperature alarm setup mode. When it flash, increase/decrease the value by +/- key to set temperature alarm. Finally, press again to confirm and exit. This prevents false alarms due to the fridge or freezer door being help open during normal use. Package Included: 1 x Thermometer Clock 2 x Transmitters 1 x User Manual