FunctionThe refrigerator thermometer Including 24-hour minimum and maximum temperature records, you can easily monitor the refrigerator temperature change and provide double protection for food safety Alarm The wireless digital display monitor with audible alarm features. When the temperature exceeds the preset minimum and maximum digital parameters, an audible alarm will sound to remind you to check and adjust the time AdjustableThe minimum and maximum temperature is displayed on the LED screen, you can manually reset the setting number. There is an adjustable hook on the back of the screen, so it can be installed on the wall or erected on the desk UsageThe screen has a temperature trend indicator arrow and daily temperature information. Not only can be used as refrigerator/freezer thermometer, but also can be used as indoor and outdoor thermometer. NoteThe digital display thermometer will update the data of temperature every 10 seconds, the indoor temperature range: 0C~+60C, outdoor temperature range: -40~60 (-40~140). Description: This is a wireless digital freezer thermometer. The digital display thermometer can be used in the freezer and act as an indoor and outdoor thermometer. Its own sound alarm can warn you of over temperature in time. Specification: Material: ABS Update rate: 10 seconds Indoor temperature range: 0C~+60C Outdoor temperature range: -40~60 (-40~140) Power supply: 2 AAA batteries for the host, 4 AAA batteries for the sensor (not included) How to install the sensor: The sensors are equipped with spring clips as well as a plastic handle to attach firmly to the edge of a shelf. The display can be attached to a magnet on a refrigerator or use the built-in keyhole for wall mounting. Package included: 1 x host (battery not included) 2 x sensor (battery not included)