3 Levels brightness can be manual selected for this electric digital clock, gentle LED lights will display in the smooth wood surface, even at night you can clearly see the time. Two modes for your choice--Voice-control mode and Always-bright mode. Voice-control mode is recommended when it's powered by batteries. Clock is powered by 2 AAA batteries. Do not show time when power is off, but it is still timing normally. Three alarm function, displays time and temperature with great functions. Time display: 12-hour or 24-hour mode. C/F display of thermometer. You can set clocks for meeting, travel, homework or everyday alarm by your own choice. Safety, environmental and fashionable. The modern design makes this portable cube alarm clock be a decoration for your bedroom, home furniture or office.