With the Beurer HM16 you measure the room temperature and humidity. The large display is easy to read, with a handy smiley indicator. The smiley on the display shows the current environmental conditions: :) = temperature 20-25°C, humidity 30-60% (ideal value) :| = random temperature and humidity less than 30% :( = random temperature and humidity more than 60% If the humidity is between 30% and 60% and the temperature is NOT 20°C to 25°C, then no smiley is displayed on the display. You can use the HM16 standing up using the fold-out stand or mount it to a wall using the hanging option (on the back of the device). Features of the Beurer HM16: Large display with smiley indicator Possibility to drop or hang The temperature can be displayed both in degrees Celsius (°C) and in degrees Fahrenheit (°F) Measuring range temperature: 0°C to +50°C Accuracy of the meeting: ± 0.1°C Humidity measuring range: 20% to 95% The accuracy of the temperature is +/- 1°C between 0-40°C and +/- 2°C >40 °C The accuracy of the humidity is +/- 5% between 40-80% and +/- 8% 80% Indicates maximum/minimum temperature and humidity of last 24 hours 1x CR2025 battery Warranty: 3 years