SMARTRO Projection Alarm Clock Digital Clock with Indoor Thermometer Hygrometer, USB Charger, Dual Alarm Clocks for Bedrooms, Travel, AC & Battery Operated;

Important Notes:
During the RC Reception Time, the Backlit and the Projector Light Will Turn Off.
During the RC reception time, the radio mast symbol starts to flash, the backlit and the projector light will turn off, this state can last for 7 minutes maximum.
At 1:00 /2:00 / 3:00 am, the clock automatically carries out the synchronization procedure with the WWVB signal to correct any deviations to the exact time.
If this attempt is unsuccessful, then the next reception takes place the next hour. This procedure is automatically repeated up to a total of 5 times.
If the reception is not successful, then the next attempt will take place the next day at 01:00 am. 
Quick Daylight Saving Time (DST) & Time Zone Setting:
1.The clock automatically starts the WWVB signal search within 7 minutes of any restart or power break.
During this RC reception time, only "-" button work while other buttons have no function.
2.Wait until the clock finished the WWVB signal searching. Or press "-" button for 2-3s to quit the RC reception.
3.Short press on "TIME"button, then press "+", "-" button to chose ON or OFF for DST function.
Customer who lives in (Arizona) AZ, please turn off the DST function. 
4.Short press on "TIME" button, the time zone display starts to flash.
Press "+", "-" to choose your time zone.
EST: Eastern Standard Time (-5)
CST: Central Standard Time (-6)
MST: Mountain Standard Time (-7)
PST: Pacific Standard Time (-8) 
5.Stop setting and wait for 20 second, the clock will automatically switches from setting mode to normal mode.
Please read the instruction manual(8.Manual Setting)to learn how to change the temperature unit, how to set the time and date and how to set the alarms,etc.