Description: Alarm Function: The temperature tester is designed with alarm function, which can show snow pattern when the testing temperature is among 4-7.9 Celsius. Easy Installation: The temperature tester with foldable hook and back lodestone design, can be easily installed on the metal for surface. Simple for Operation: The temperature tester can be easily turned on/off by the back power button for power saving, and you can switch between for Fahrenheit and Celsius units by the button. Compact Size: The tester is compact, which will not occupy much installation space on your refrigerator. Scope of Application: The temperature tester is the perfect tool to help you the refrigerator inside temperature in real time. Specification: Material: plastic, electric component. Color: black/ white. Max and minimum memory function supporting Temperature arrange: -30 to 60 Celsius. Cold alarm arrange: 4-7.9 Celsius. Battery working time: over 8 month. Battery: CR2032 button battery (included). Main body size: Approx. 6.85x4.38x1.13cm/ 2.69x1.72x0.44inch. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Temperature Tester. 1 Piece English Manual. 1 Piece Package Box.