Thermo hygrometer -Displays the current time, temperature and relative humidity, Provides a quick overview: room climate indication by color green = good air quality, red = bad air quality Small and elegant: ideal for unobtrusive monitoring of indoor climate Individual adjustable range for room temperature and humidity Multiroom display: Several units can be managed via the app Low battery warning, °C / °F can be set Option for wall fastening, 2 x 1.5V AAA-batteries included Basic info displayed on the device, with free app "beurer FreshRoom" to download for long-term monitoring