Tzou Cube Wood LED Alarm Clock - Time Temperature Date - Sound Control - Latest Generation Displays Time, Date, and Temperature alternately It also works in voice mode. Make some noise (clap your hands, rap on the table or pat the clock) nearby can wake it up Time display 12-hour or 24-hour mode Optional Five Alarm Settings with "beep" sound lasting 1 minute Power Supply: 4 x AA batteries or USB cable