Usage Tips:Product Color: silverMaterial: plastic + quartz glass mirrorProduct size: 13.5 * 3 * 8cmPower supply : 2 x AAA batteries (not included) or USB power cord (included) Power supply: AAA * 2PCS battery / DC 5.0V power adapter Temperature detection: -9+50 ( 15122) Resolution 1/Humidity detection: 20%95% Resolution 1%Temperature and humidity calibration time: 30 secondsSupport USB, to charge the phone 1.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.2.Projection FunctionAll the 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 time angle makes it easy to choose the right angle.3.Automatic clock, indoor temperature and humidityAtomic clock will automatically display the correct time (12/24 format) for you. Indoor temperature and humidity units are clearly displayed. Temperature is displayed in either C or F. These additional features will help you make a decision for your daily wear.4.USB Port, Dual Alarm with Snooze FunctionSet two separate ones 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 you to easily charge electronic device.5.Dimensions and Power Supply about 13.5*4*8.5cm; 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 run it with battery, so this projection alarm clock can be used for outdoor travel.