ThermometerWireless Refrigerator Thermometer with Digital Sound Alarm and 2PCS Sensor, Min/Max DisplaySpecificationsMaterial: ABSUpdate rate: 10 secondsTransmission range. 328 feetIndoor temperature range: 0C ~ 50C (32 ~ 122)Outdoor temperature: -40C ~ 60C (-40 ~ 140)Power supply. 2 AAA batteries for main unit, 4 AA batteries for sensor (not included).+ productDescription :This is a wireless digital freezer thermometer.It can be used in the freezer as an indoor and outdoor thermometer.Its audible alarm can alert you in time if the limit temperature is exceeded.How to install the sensorThe sensor is equipped with a spring clip and a plastic handle to hold it firmly on the edge of the shelf.The display can be magnetically attached to the refrigerator or fixed to the wall using the integrated keyhole.Features :The minimum and maximum temperatures are displayed on the LCD screen and can be reset manually.It has internal and external audible alarms. The device emits an audible alarm when the temperature exceeds the preset minimum and maximum values.Easy-to-read LCD display shows current indoor and outdoor temperatures. LCD display indicates if battery is low.Includes 24-hour minimum and maximum temperature readings to allow you to easily monitor temperature changes in your refrigerator, providing double protection for the safety of your food.With arrows indicating the temperature trend and daily information on maximum and minimum temperatures.Comes with an adjustable hook allowing the dispenser to be hung on a wall or used upright on a table.FeaturesAttention :Do not install batteries reversed.Do not place the receiver near metal.Avoid placing the transmitter directly in the rain.Package includesx Main Unit (Batteries not included)2 sensors (batteries not included)1 x User Manual