?2 Power Supply Methods? It supports USB power supply and AAA battery. Only when the clock is connected to a power source with a USB cable (included), the screen of clock will be always on. This alarm clock has a time memory function when using AAA batteries(not included); When powered by USB alone, there is no memory function after power off. ?Adjustable Snooze Time?The digital alarm clock supports adjusting the snooze interval. You can adjust the time from 5 minutes to 60 minutes as needed. ?Dual Alarm Clock Setting?Dual alarm function allows you to set two different wake-up times to ensure couples with different routines or a backup for waking up heavy sleepers. ?Brightness & Night mode?Clear white LED display comes with 3 different levels of brightness to meet your different needs in both daylight and night time. ?Large LED Display?This Digital alarm clock comes with 6in large screen and white bold font so that you can easily read the digital display. It with temperature, date display, and supports 12/24H time, °C/°F switching.