Features: LCD digital display: the LCD screen has large numbers, records minimum and maximum temperatures and provides historical temperature readings. With this feature you can easily monitoring temperature changes in your fridgerator, providing double protection for your food safety. Smart Thermometer: The wireless thermometer console includes audible and visual alarms when the temperature exceeds your preset minimum and maximum alarm settings. Easy to use: with 6 function keys on the main unit and signal indicators on the transmitter, you can turn the alarm on/off by simply pressing the corresponding key. Wide application: you can use it in your fridgerator, freezer or outdoors to provide safe food storage. Easy to install: This wireless thermometer is easy to install. The display unit can be stood on a table, hung on a wall and attached to a fridgerator with magnets. The wireless sensor can be clipped to the door or hung on the wall. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Wireless Frequency: 433MHZ Wireless range: 100m without interference Host measurement range: 960°C Size: as shown Power source used: 2 x AAA batteries not included Transmitter range: -4060°C Use of power supply: 2 x AA batteries not included Housing material: Plastic ABS Package List: 1 x Digital Alarm Thermometer