1.Wireless signal transmission distance without interference 100 meters, can display two different maximum and minimum temperature records at the same time.2.℃/˚F unit conversion: Celsius and Fahrenheit display can be switched to meet daily needs and has strong signal penetration.3.ALARM SETTINGS: When the indoor or outdoor temperature exceeds the preset minimum and maximum alarm values, the thermometer will emit an audible alarm and a visual alarm to alert you and allow you to see if adjustments are needed.4.EASY TO INSTALL AND OPERATE: Use the magnet on the back to magnetically attach the thermometer directly to your refrigerator or freezer, or place it on a table.5.APPLICATION: Can be used in the refrigerator, freezer or indoors and outdoors to easily monitor temperature changes and provide double protection for your food.Parameter:Measuring range (transmitter): -40℃~60℃ ( -40℉~ 140℉)Tolerance: ±1℃ ( ±2℉ )Temperature Resolution: 0.1Wireless Frequency: 447.6MHZWireless range: 100 meters without obstaclesMain unit size: 95x62x20mmTransmitter size: 95x36x20mmUse of power: (default delivery without batteries)Host: 2pcs 7 batteries (AAA)Transmitter: 2 pcs of 5 good batteries (AA)Colour:WhiteMaterial:plasticPackage Contents:1 x Thermometer2 x TransmitterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.