[Power-off Memory] With micro USB power cable(included), you can plug it into any unused USB port via power adapter, cable box, TV, computer, etc. In case of power outage, the button cell battery(built-in) preserves time and alarm settings , but the display will not be visible until power is restored. [2 Fixed Options] The day clock can be placed on a desk with a bracket. The hanging hole allows the clock to be hung on the wall. The day clock with large digital display is perfect gift for your family and friends. Suitable for classroom, study, bedroom, living room, kitchen, office, reception area, etc. [Weekend mode & DST] The weekend mode alarm can automatically close on the weekend, making sure you have a good night's sleep. And you can also toggle between daylight saving time and standard time with the [DST] button. [Dual Alarm & 3-level Volume] If you and your partner get up at different hours, 2 alarms are a worthy extra feature. With dual alarms, you can set one alarm clock with 2 different wake-up times and adjust the volume level to your liking. The alarm volume can be set at low (60dB) or high volume (90dB) for light or heavy sleepers. [11.2" LED Display] Big white LED numbers easy to read day or night, and 4-level display brightness can be easily adjusted for personal preference. You can also turn it completely OFF for a sound sleep at night. 12 or 24 hour time display optional.