Features: Made of ABS material it is wear- and corrosion-. With LCD display large screen display clear data display temperature display can be converted indoors and outdoors. It is equipped with probe to support outdoor temperature maximum and minimum alarm. Low power consumption high stable performance sensitive response long-term use. The Maximum/Minimum button allows you to view maximum/minimum indoor/outdoor temperature and humidity. The ℃/℉ button can be to convert the temperature unit. The method of is simple and practical. It is widely and easy to use. It can be placed in refrigerators factories aquariums and homes. Specification: Condition: 100% Material: ABS Deviation: ±1 °C Accuracy: 0.1 ° C Temperature Range Indoor: 0°C - 50°C 32°F - 122°F Temperature Range Outdoor: -50 ° C - 70 ° C -58 ° F - 158 ° F Battery: 1.5V 1 x AAA Battery Battery Not Included Weight: Approx. 63g / 2.2oz Size: Approx. 63x63x14mm / 2.5x2.5x0.6in Length of Sensor Cable: Approx. 1.5m method: 1. Maximum/Minimum button: Press the Maximum/Minimum button the screen will display the maximum temperature and humidity detection and press the Maximum/Minimum button again the screen will display the lowest temperature and Humidity detection. 2. IN/OUT button: This product is the default to display when the outdoor temperature and humidity are displayed outdoor temperature probe and the indoor mode can be changed by pressing the IN/OUT button. 3. °C/°F button: Press the °C/°F button black button on the back of the product once to select Celsius or Fahrenheit. 4. Alarm setting button: press the alarm button for 2 seconds the screen will flash the product will change the alarm setting mode high highest temperature is set to the default press the alarm button again to change Low lowest temperature setting. When the number of screens is flashing press the °C/°F button black button on the back of the product to set the temperature range temperature range is -50 - 70°C. After the setting is completed press the alarm button again to resume normal display. Package List: 1 x Thermometer Battery Not Included 1 x Connecting Line Note: 1. If the screen data is not clearly displayed it indicates that the battery is insufficient and needs to be replaced. 2. When replacing batteries the alarm clock needs to be reset and the highest/lowest temperature and humidity should be removed.