Large LED display and Snooze function: This digital alarm clock has a large 6.7 inch LED mirror display, which is easy to read; the Snooze button helps you easily turn off the alarm without opening your eyes. Snooze time can be set from 1 to 60 minutes (default snooze time is 5 minutes) Adjustable brightness: Clear and comfortable viewing, automatically dimmed at 6:00 p.m. When plugged in with a USB cable, the LED will always be on. When using battery mode, the screen automatically turns off after 10 seconds. You can activate the screen by voice or by pressing any key to turn on the screen. Press and hold "LIGHT/SNOOZE" for 3 seconds in any mode to turn off the screen. USB or Battery Powered: The alarm clock can be powered by USB cable or 3 AAA batteries ( not included). NOTICED : If the alarm is running on battery, the alarm will turn on for 5 seconds then turn off, you can activate the splash screen by pressing the sound. Save energy and improve your night's sleep. If via USB, the clock will always be on. EASY TO USE AND IDEAL GIFT: The design of the clock is so simple that you will have no problem using it. A sophisticated digital clock that provides accurate time for heavy sleepers, kids, teens, students and seniors - the right size makes it perfect for your travel alarm, desk clock or bedside clock needs.