Power supply The alarm clock is powered by 2 x AAA batteries (not included) or USB power cable (included) Charging function When the USB cable is used, the mobile phone or PDA can be charged through the USB plug on the left side of the alarm clock Automatic snooze When the alarm rings, tap the light/snooze button to activate the snooze function; the alarm clock on/snooze button to turn on the backlight for 8 seconds Projection The projection lamp of the alarm clock can project the current time and temperature of the clock on the wall or roof LED digital display The smart alarm clock has a large display screen, which is convenient for you to read the time