Air Comfort IndicatorHumidity with an arrow. It is divided into 3 levels: dry/comfortable/humid, and a good helper to control temperature and humidity. When the and humidity is 30%69%, the arrow will automatically point to the green COMFORT icon. 2 Sensors and Fast ResponseLIORQUE thermo-hygrometer updates the reading every 10 seconds to provide accurate to deliver measured values. The temperature measurement range is -9~60. (NOT suitable for sauna) Memory functionThe hygrometer & LIORQUE thermometer can remember the highest and lowest temperature and humidity within 24 hours. It is a nice companion to take care of children and the elderly. Great Accuracy & / SelectableThere are 2 vents of the thermo-hygrometer, which allows the wind to flow to get the accurate data in time. A button on the back allows you to quickly switch between Fahrenheit and Celsius. Longer Battery LifeThe hygrometer & Inside thermometer is powered by 2 AAA batteries (included). It is ideal for use in the nursery, greenhouse, office or wine cellar etc. LIORQUE Thermometer & Hygrometer Indoor With a highly accurate temperature and humidity measurement function, the humidity meter helps keep your family's living environment in the best condition. The temperature and humidity monitor provides you with daily high and low humidity/temperature records. Its extremely sensitive sensors are updated every 10 seconds to show the latest readings. Tips: Do not put the hermometer & Hygrometer in the extremely high or low temperature environment, as it will cause damage to electronic parts and plastics. Remove the batteries from the device if you intend to store it for a few months. When the humidity is between 30% and 69%, the small triangle pointer will not be displayed. Package Contents: 1 * Thermometer & Hygrometer Indoor 1 * User Manual 2 * AAA Batteries