Whether you're waking up for work, school, or your daily morning walk, the White Digital Alarm Clock won't let you down! Measuring 4.75" x 2", this stylish alarm clock features a matte white frame and its digital display not only shows the time (in either 12-hour or 24-hour format), but can also be programmed to rotate to show the date and the ambient temperature in either Celsius or Fahrenheit. This clock runs on three AAA batteries, but does require the USB to be plugged in at ALL TIMES in order to permanently display the time/date/temperature. When the clock is not plugged in, the time/date/temperature readings will disappear, requiring you to tap on the top of the clock in order to re-appear.