THE ROOM AND THE FREEZER CAN CHANGE DIFFERENTLY — This WiFi freezer temperature monitor tracks indoor temperature and humidity while its external probe watches the space inside. A freezer thermometer with app gives you both readings at once, so you can see more than just the temperature outside the door. SET LIMITS BEFORE YOU NEED A FREEZER ALARM — Choose your own high and low thresholds in the Smart Life App. When probe temperature moves outside your range, this freezer temperature alarm sends an app notification to your phone. Your freezer alarms go straight to your smartphone, giving you a chance to check what changed. -40°F TO 248°F WATERPROOF PROBE — Put the probe where the reading matters most: inside freezer compartments, refrigerators, aquarium water, or wine cellars. The 39.37 in cable keeps the main unit outside for easier viewing, because a fridge temperature monitor should not make you keep opening the door. CHECK IN WITHOUT MAKING ANOTHER TRIP TO THE APPLIANCE — This WiFi freezer temperature monitor connects directly to 2.4 GHz WiFi with no hub required. Use it as a remote freezer thermometer to check current conditions, review up to one year of trends, and export records from this refrigerator temperature monitor when a reading needs a closer look. CALIBRATE YOUR FREEZER TEMPERATURE ALARM FOR YOUR SPACE — Every refrigerator and freezer setup behaves a little differently. Indoor temperature range: 14.5°F to 140°F; humidity range: 0% to 99% RH. A freezer alarm works better when it reflects your setup, so calibrate indoor temperature, humidity, and probe readings in the app. This makes it a more tailored freezer thermometer with alarm. ASIN B0FQHWQV9S Size Freezer Thermometer 1 Pack Brand Daytech Color White 1pc Item Length 2.8 inches Item Weight 0.07 kg Manufacturer DAYTECH Model Number NUS-TH01-1 Control Method App Item Highlight Fridge Temperature Monitor, -40°F to 248°F Probe Range, Indoor Temp and Humidity, Deep Freezer Monitoring Mfr Part Number NUS-TH01-1 Number of Packs 1 Sensor Technology Temperature Sensor Compatible Devices Smartphone Number of Batteries 3 AAA batteries required. (included)