TEMPERATURE DISPLAY: The minimum and maximum temperature are displayed on the LED screen, the indoor temperature range is 0 to 50 (32 to 122), the outdoor temperature range is -40 to 60 (-40 to 140). It can be reset manually. AUDIOUS ALARM: Comes with an audible alarm for indoor and outdoor use. If the temperature exceeds your preset minimum and maximum alarm settings, an audible alarm will sound. MULTIFUNCTION: The fridge alarm thermometer can be used in the freezer and serves as an indoor and outdoor thermometer. TEMPERATURE RECORDS: Contains 24-hour Min and Max temperature records and you can easily monitor your fridge's temperature change and doubly protect your food safety. EASY TO PLACE: Comes with an adjustable hook so the display can be wall mounted or stand upright for tabletop use. Description: This is a wireless digital freezer thermometer. It can be used in the freezer and used as an indoor and outdoor thermometer. A dedicated audible alarm can give you timely warning of over temperature. Properties: The minimum and maximum temperatures are displayed on the LED screen and can be reset manually. Indoor and outdoor audible alarm. If the temperature exceeds your preset minimum and maximum alarm settings, an audible alarm will sound. It can be used in the freezer and used as an indoor and outdoor thermometer. Includes 24-hour min and max temperature records. You can easily monitor the temperature change of your refrigerator and doubly protect your food safety. With a temperature trend arrow and daily highs and lows. Comes with an adjustable hook so the screen can be wall mounted or stand upright for tabletop use. Specification: Material: ABS Update rate: 10 seconds Indoor temperature range: 0~50 (32~122) Outside temperature range: -40 ~ 60 (-40 ~ 140) Power supply: 2 x AAA battery for host, 4 x AAA battery for sensor (not included) To install the sensor: The sensors feature spring-loaded clips and a plastic handle that attaches firmly to the edge of a shelf. The display can be magnetically attached to a fridge or attached to the wall using the built-in keyhole. Delivery content: 1 x Host (battery not included) 2 x sensors (battery not included) 1x User Manual Note: Do not install the reverse battery. Do not place the receiver near