LCD display features sound-control backlight , making it easier to read without picking up in dim light conditions,any sound will make LED being on, superbly simple. Multiple functional monitor: work as hygrometer, thermometer, alarm clock, calendar, week, day, time, weather forecast, comfort icon ect. Indoor Humidity Meter ensures proper humidity control, which has important skin,asthma, allergen and other health benefits; 5 Years Warranty. Thermometer measures humidity and temperature accurately , Display of icons for 4 levels -- Peaceful Face（DRY）/Smiling Face (COMFORT)/(Unhappy Face)WET/No icons, The smile comfort icon will appear when humidity is 50%-70% and temperature is 22℃-25℃. Hygrometer displays in fahrenheit or celsius, switch 12/24 hour system, to adapt to your habits.