Keep tabs on the vaccines you have stored with this refrigerator / freezer vaccine data logger with alarm The VFC 400 vaccine monitoring kit measures and stores up to 15,905 temperature readings from an external probe The display is designed to show at a glance if temperature excursions have occurred during the current day and up to the previous 29 days The display also shows the current temperature reading, the current time, recording status and battery status The alarm is triggered if temperature readings are outside pre-set alarm limits The status indicator changes from a check mark to an X and the audible alarm will sound From the display you can review the minimum and maximum temperatures for each day the VFC 400 has been logging, up to 30 days The VFC 400 resets the minimum/maximum temperature at midnight every night and puts an inspection mark on the chart indicating the minimum/maximum has been checked LCD / LED display Glycol bottle probe Records temperatures from -40° to 210° F (-40° to 99° C) USB 2.0 / Micro USB Socket Cable is 5 feet long 3/4 x 2-4/5 x 5-1/2 inches