【Two Wireless Sensors】This smart thermometer controls the main unit and 2 wireless sensors are included, they can be used in different places of the refrigerator and also as indoor and outdoor thermometers. In addition, the room temperature and the temperature monitored by the 2 sensors (refrigerator/outdoor) can be displayed at the same time on the main unit. 【Reminder Alarm & MAX/MIN Record】This wireless refrigerator thermometer has an audible alarm function. You can manually set the maximum and minimum alarm values. The audible alarm will sound when the temperature value reaches the preset limit of the maximum or minimum alarm value. The max/min record provides a temperature history of the past 24 hours. 【Easy to Use】The digital thermometer has 6 function buttons, each transmitter corresponds to a signal. Simply press the corresponding button to turn the alarm on/off, convert the temperature unit °C/°F and clear the max/min record. Its compact and user-friendly design makes it