High Accuracy & 10S RefreshUsing Triple-A battery (not included). Built-in accurate thermometer hygrometer sensor, the temperature and humidity sensors check the environment about every 10 seconds, then automatically refresh the screen display to provide the most accurate readings. The temperature range is -4F to 158F, the humidity range is 10% to 99%. Switch the unit between Fahrenheit and Celsius with a single tap Accurate and fast refresh: The hygrometer refreshes every 10 seconds to provide you with the latest readings. Temperature range -9~60, accuracy 1; Humidity range 20%~95%RH, accuracy 5%RH. 24-hour high and low records: digital thermometer hygrometer Track the status throughout the day with high and low records to ensure a healthy home. Reliable operation buttons on the back for manual adjustment of F/C switching, easily meet the needs of different people.NOTE: Yes backlight function - 10 seconds lighting time Three ways of placementThe thermometer hygrometer can be placed on the table through the back bracket or installed on the wall through the hanging hole on the back. In addition, magnets can fix the thermometer hygrometer on the refrigerator. you place it anywhere you want like refrigerator, counter, living room, baby room, kitchen, basement, office, greenhouse, guitar room, study, garden and cellar Clear LCD Display: It clearly displays the real-time temperature/humidity readings and time on the LCD screen, which allows you to read the big and thick numbers clearly even from a long distance. Pocket Size: With an overall size of 79*58*22mm, the digital thermometer and hygrometer is slim and portable. Save space and easy to carry. Delivery quantity: 1 piece