Min/Max Digital Thermometer -4°F to 122°FWaterproof Refrigerator Fridge Thermometer, Digital Freezer Room Thermometer, Max Min Record Function Large LCD Screen and Magnetic Back Bigger screen, Better reading : This fridge thermometer has 2. 56 inch electronic LCD display, the information on the screen can tell us the max, min and the current temperature at the same time. Powered by 3 Volt Model CR2032 Lithium Battery(Included). You can learn the accurate temperature info of your freezer room