1.2 Wireless Sensors: Builtin console and 2 remote sensors, the wireless refrigerator thermometer can simultaneously display the indoor temperature and 2 groups of outdoor temperature. You can use it in the refrigerator, freezer or outdoors. It will provide safe food storage and help you in a healthy life. 2.Record Max/Min: Temperature Range: ±2°F (±1°C). The range of indoor/outdoor thermometer: indoor 10℃60℃(14℉140℉), external 40℃60℃(40℉140℉). The accuracy can reach ±1℃/±2°F.The transmission range is 100M / 328ft (open area). The freezer thermometer can record historical readings of maximum/minimum temperature. Indicates the current temperature trend via the up, down and parallel arrow 3.Audio Alarm Setting: The refrigerator thermometer can be manually set to the Max/Min alarm value. The alarm will sound when the temperature value reaches the /bottom point. It is helpful for you and your family to know the temperature and make some changes over time 4.Easy to use: With 6 function keys, just press the corresponding key to operate, change Celsius or Fahrenheit and clear the Max/Min records. Plus, the compact and intuitive design makes it for mounting on all types of refrigerators or freezers