Features: 1. The minimum and maximum temperature are display on the LED screen and can be reset manually. 2. With indoor and outdoor audible alarm. When temperature exceed your pre-set minimum and maximum alarm setting, it will make a sound alert. 3. It can be used in the refrigerator and act as therometer indoor and outdoor. 4. Includes 24 hours Min and Max temperature records and you can easily monitor the temperature change of your refrigerator and provide double protection to your food safe. 5. With a temperature trend indicator arrows and daily high and low information. 6. Comes with a adjustable hook so the dispay is wall-mountable or stands upright for desktop use. How to Install the Sensor: 1. The sensors are equipped with a spring-loaded clips along with a Plastic grip to tightly attached to the edges of a shelf. 2. The display is magnetic-mountable on a fridge, or use the integrated keyhole for wall mounting. Notice: 1. Do not install the reverse battery. 2. Do not put the receiver near metal. 3. Avoid transmitter directly in the rain. 4. The battery is not included. Specification: Type: Wireless Refrigerator Thermometer Material: ABS Indoor temperature range: 0~+60degC. Outdoor temperature range: -40~+60degC. Accurate temperature: +/-0.1 Power Supply: 2 X AAA battery for the host, 2 X AA battery for the sensor Wireless range: 100m when no interference includes:1 x Host (Battery not included) 2 x Sensor (Battery not included)