Features:1. display can not always bright when using the battery， and the screen is not esay to see when the light is not bright inside. screen always when using force (no battery).2. no memory， you need to reset the time after a power failure.3. No margin of error with temperature and Humudity professional meter， and the weather forecast is for reforence only.4. The power and the battery can not be used together， otherwise it will damage the alarm.3.7 "LCD screen displays the time， temperature， humidity， and the weather.with colorful led backlit.project accurate time， and projecting angles are 180 degrees adjustable.support alarm clock snooze mode.two modes available time: 12 hours and 24 hoursdigital thermometer show as centigrade or Fahrenheit.with max / min temperature and humidity record.powered by 2 * aaa batteries. (Batteries not included in the package.)note: the continuous backlighting and projection can be available only supplied power adapter is connected. specification:Humidity range: 20% ~ 99% rh rhTemperature range: 0 ~ 50 degrees / 32 ~ 122 fahrenheitCalendar: 2001 - 2099Battery type: 2 * aaa batteries (not included) Package:1 * LED projector alarm clock