All-in-One Functions ----- Wireless projection alarm clock with indoor temperature and humidity display; Temperature & time projection with ON/OFF button; 1 USB chargers; 2 alarm and snooze functions; DCF automatic time setting with time zone selection; Calendar with 7 language choices; time in 12/24 format; 4-level backlight selectable with power supply. Projection Function ----- All information on the display is easy to read from any angle. Project time and temperature at the same time. Press button to project with battery for 8 seconds and keep project with AC adapter, you can also use ON/OFF button to control it. Adjustable timing angle makes it easy to choose the appropriate angle Automatic clock, indoor temperature and humidity ----- Atomic clock will automatically display the correct time (12/24 format) for you. Indoor temperature and humidity units are clearly displayed. The temperature is displayed in either C or F. These additional features will help you make a decision about your everyday clothing. USB port, dual alarm with snooze function ----- Set two separate alarms for different purposes. Press the top button to snooze the alarm for an extra five minutes of sleep time. USB output interface on watch allows easy charging of electronic device. Dimensions and power supply ----- about 13.5cm*8cm*3cm; 2x AAA batteries (not included) or power adapter ( included ). Touch the top of the clock to activate the backlight and projection for 8 seconds. Backlight and projection keep light and the backlight has 4 level selection with power supply. You can operate it with battery, so this projection alarm clock can be used for outdoor travel