Description: Project time onto your walls or ceiling so that the time will always be in full view. 180-degree swivel projection means you'll never have to roll over to view the time again. Multi-function: 12/24 hour time display / Indoor thermometer range (0C~+50C/+32F~+122F) / Indoor hygrometer(20%-99%) / Perpetual calendar with day of week./Snooze feature on alarm clock. Energy-saving clock - When clock is powered by batteries, clock's backlight and projection only stays on 8 seconds by pressing the SNZ/LIGHT button. When it is powered by external power, clock's backlight and projection will always stay on. Coloured LED back light Display, Memory Function - Record the max and min value of T&H, detection cycle every 60 seconds. Display temperature trend in 12 hours. Long press UP button can switch 12/24. Power Supply: 2x AAA battery (not included) / DC 4.5V input (cable included) Specification: 3.7" LCD screen Clock Projection distance 1-5m Alarm clock supports snooze mode. Two time modes available: 12 hours & 24 hours Digital thermometer shows as centigrade or Fahrenheit. With Max/Min temperature and humidity records. Colour digital screen displays time,date,temperature, humidity, weather and calender. Projects the accurate time, and the projection angle is 180 degree adjustable. Power Supply: USB cable included (main adapter not included) / 2x AAA battery (not included) Package Includes: 1 Piece Alarm Clock 1 Piece USB Charging Cable 1 Piece User Manual Note: 1.There are two types of power supply: A: The batteries will get more power, the projection and screen will automatically disappear for a few seconds, if you want to see the time, press the top of the "LIGHT" button. B: if you use USB to power supply, like normal mobile phone, the projection and the screen is always bright, you do not press, it can directly see the time. 2.The alarm clock without memory function, you have to reset the time after power failure. 3.Battery and power can not be used at the same time, otherwise it will damage the alarm. 4.Comparison with professional temperature and humidity gauges, there are some mistakes. The weather forecast is for reference only.