The built-in Swiss-made sensor features a typical accuracy of ‡3%RH, ‡0.3°C / 0.54°F. By obtaining and updating data every 2 seconds, the sensor gives you accurate current information. Receive instant app notifications when temperature or humidity levels fall outside your customized ranges. React promptly to sudden air condition changes whenever the need arises. The sensor automatically turns on/off appliances connected to Tapo devices, such as heaters, fans, and humidifiers, to adjust the comfort level in the room. It also helps to save on your energy bills. The Tapo Smart Temperature and Humidity Monitor uses two AAA batteries and lasts for up to 2 years. Press the side button once to switch the temperature unit. Double press to switch the display position of temperature and humidity. Keep an eye on your home's comfort levels at a glance. You can also customize your comfort zones in the Tapo app.