This dual-purpose freezer and fridge thermometer manages to be in two places at once. Using two wireless, remote thermometers, communicating with a door- or wall-mounted display you will be able to:Be alerted when freezer or refrigerator temperatures are out of preferred rangeStore foods at safe temperatures to prevent food spoilageAvoid related foodborne illnesses Wireless thermometers The digital thermometer display shows refrigerator and freezer temperatures, and records highs and lows for each environment, as recorded by each remote thermometer.Programmable alarm notifies you audibly and visually when temperatures exceed your set minimum or maximum rangeDigital thermometer display has magnetic and keyhole mountingsComes with one wireless refrigerator thermometer and one wireless freezer thermometer The digital display is powered by 2 AAA batteries. Each sensor is powered by 2 AA alkaline or lithium batteries (not included). Lithium batteries recommended for use in sensors for temperatures below 4 degrees Fahrenheit (-20 degrees Celsius). Food protection By using this combination of temperature gauge and freezer monitor, you will rest assured that your familys food is stored safely and appropriately. It's more than accurate; it's AcuRite.