Maverick Cold Chek Refrigerator/Freezer Digital Thermometer displays 4 temperatures; Instant freezer temperature; Weekly average freezer temperature; Instant refrigerator temperature; Weekly average refrigerator temperature; Updates instant readings every 5 seconds; Updates weekly average temperature every 5 minutes; Thermistor extension wire for freezer compartment; Self adhesive mounting bracket allows unit to be removed for battery replacement; Low battery detector; Readings in either Fahrenheit or Celsius; 2 replaceable 1.5 AAA batteries included.