Product Details: – Wireless Fridge Thermometer Digital Freezer Alarm Gauge Monitor 2 Sensors Features: – Easy to read LCD screen displays the current indoor outdoor temperature.When insufficient electricity,there are will be shown on the LCD screen – With a temperature trend indicator arrow and daily high and low information – Display stands upright for tabletop use or is wall-mountable – Includes 24 hours high and low records for temperature – The display console displays temperature,minimum and maximum temperature, which can be reset manually Specifications: – 1. 433 Mhz transmission frequency – 2. Update Rate: 10 seconds – 3. Transmission range up to 328 ft,range maybe shorter based on interference present. – 4. Indoor Temperature range:0Celsius-50Celsius,32 Fahrenheit 122Fahrenheit 5. Outdoor Temperature range:40Celsius -60Celsius, -40 Fahrenheit – 140 Fahrenheit 6. Power Supply: Host—2pc AAA Battery,Not included. – Sensor—2pc AA Battery,Not included. Note: – 1. Do not install the reverse battery – 2. Do not put the receiver near metal – 3. Avoid transmitter directly in the rain – 4. High-quality batteries for the use of main unit and transmitter better – 5. The sensor search mode allows you to re-sync sensors without removing and re-inserting batteries How to Install the Sensor: – The thermometeR Is digital display is magnet-mountable on a fridge,or use the integrated keyhole for wall mounting. The wireless thermometer sensors are equipped with a spring-loaded clips with a Plastic grip to securely attached to the edge of a shelf. Package Included: – 1 x Host – 2 x Sensor – 1 x User Manual Notes: – The colors may be a little different for the different monitor display. – Please allow minor deviation due to manual measurement