There is a protective film on the digital clock mirror screen. Please remove it before use. When the digital alarm clock runs on battery, the screen will light up for 5 seconds and the display will turn off to save energy. If you want to keep the time glowing all the time, please plug in a USB cable. Large LED Display and Snooze Function: This digital alarm clock features a 6.7-inch LED mirror display for easy reading. With the snooze button, you can easily turn off the alarm ring without opening your eyes. Can set snooze time from 1 to 60 minutes. USB Powered and Built-in Backup Battery: This bedside clock includes a USB charging cable for you to power it conveniently. The time display supports both the 12-hour and the 24-hour format. NOTE: When the alarm clock running on battery, the alarm will illuminate for 5 seconds and then turn OFF and illuminate again if you press any button on the alarm. Save energy and sleep better at night. Easy to Use & Ideal Gift: The clock is designed with absolute simplicity in mind and you will have no problem operating it. Exquisite digital watch with accurate time for heavy sleepers, kids, teenagers, students and Elders - The convenient size makes it ideal for your purposes as a travel alarm clock, desk clock or bedside clock. It is an excellent gift idea for birthday, graduation, housewarming and new year ect.