Minimum and maximum temperature are shown on the LED display and it can be reset manually. With indoor and outdoor audible alarm, when the temperature exceeds your preset minimum and maximum of the alarm, it will make an audible alert. It can be used in the freezer and act as an indoor and outdoor thermometer. Comes with an adjustable hook for the display to be wall mounted or free standing for tabletop use. The thermometer features 24 hour min and max temperature records and allows you to easily monitor your refrigerator's temperature change and provide double protection for your food safety. Product Description Wireless Digital Buzzer Alarm Fridge Thermometer With 2PCS Sensor Min/Max Display This is a 'a wireless digital freezer thermometer. It can be used in the freezer and act as an indoor and outdoor therometer. Its own audible alarm can warn you when the temperature is exceeded in time. How to Install the Sensor : The sensors are equipped with a spring-loaded clips with a plastic handle for tightly attaching to the edge of a shelf. The display is magnet-mountable on a fridge , or use the built-in hole for wall mounting. Package Contents: 1 x Host (battery not included) 2 x Sensor ( battery not included) 1 x User Manual Applicable Scene Refrigerator Refrigerated Truck Warehouse