ULTRA CLEAR SCREEN: Compared with conventional LCD displays on the market, the 2.3'' E-ink screen is clearer and sharper. Eye-protecting. 360-degree HD viewing experience. Extremely low power consumption. Good for a healthier life. Smiley comfort icons indicate room conditions. HIGH-PRECISION SWISS SENSOR: The digital indoor thermometer updates every 4 seconds to obtain the latest environmental data. Humidity accuracy: +/- 0.3%; Temperature range 0 to 60 degrees Celsius. Humidity range: 0%RH~100%RH. Used to control the indoor climate and prevent mold. WIRELESS BLUETOOTH MONITORING: Thanks to the high-tech Bluetooth 5.0 chip, the thermometer hygrometer can determine and record the indoor climate. The temperature and humidity data are transferred to the app and can be read online for free for six months. VERSATILE APPLICATIONS: The dual thermo-hygrometer records the development of humidity and temperature, for example, in an attic apartment, wine cellar, etc. The same account can be connected to multiple devices. The app works with Android 8.0 and iOS 9.3. COMPACT DIMENSIONS: The measuring device is smaller than conventional products (3.5 x 3.5 x 1.6 centimeters) and, thanks to the included stand, can be placed discreetly in any room. There are three options: tabletop / magnetic / wall mounting. The mounting hardware is included. 100% guarantee and guaranteed good service.