Multi-functional alarm clock Four alarm clock functions, temperature display, time display, three groups of alarm clocks, date display, excellent functions. Time display: 12 hour or 24 hour. C/F thermometer display. You can choose to set the clock for meetings, trips, homework or daily alarms Adjustable Brightness This electronic digital clock can manually select 4 levels of brightness, which are red lights, blue, white and green, soft LED lights will be displayed on the smooth wooden surface, you can see clearly even at night USB or Battery Powered The clock is powered by 3 AAA batteries ( not included) or USB. The time is not displayed when the power is off, but it is still normal time Modern decoration design Safety, environmental protection and fashion. The modern design makes this cube portable alarm clock a great addition to your bedroom, furniture or office.