Large LED Display & Snooze Function: This digital alarm clock features a large 6.7-inch LED mirror screen, easy to read, and super-thin Also doubles as a mirror; 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 vision, automatic dimming at 6:00 pm. When plugged in with the USB cable, the LED light will always be on. When using battery mode, the screen will automatically turn off after 10 seconds. You can activate the screen with your voice or press any key to turn it on. 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 a USB cable or 3 AAA batteries (not included). Note: If the alarm clock is working on battery, the alarm clock will turn on for 5 seconds and then turn off, you can activate the turn on screen by clicking on the sound. Save energy and improve night's sleep. If via USB, the clock will always be on. EASY TO USE AND IDEAL GIFT: The clock was designed with absolute simplicity in mind, you'll have no problem using it. Sophisticated digital clock with accurate time for sleepers, kids, teens, students and seniors - the perfect size makes it ideal for your travel alarm clock, desk clock or bedside clock needs.