Cell button Memory Function: A cell button was installed in the product, which memorize the time, date and alarm time settings inaccurate in case of power interrupt. Cell button can not power the clock. The clock itself powered by USB cable, the cable can be plug in any power DC 5V adapter or any USB power strip. Adjustable Brightness Settings: 5 Level brightness of display can be adjusted, Other than that, there are also a friendly automatically dimmer function, the brightness of display will automatically change in different period time. Dual Alarms with Music Ring: 2 sets of alarms can be set for heavy sleeper or people with multiple alarm clock needs, each alarm can be turned on/off separately. 40 classic music can be choose for wake up ring. Let music wake you up start a beautiful day!. Muti-Display Desktop Clocks: Not only show time, but also display date and temperature. Time and date are displayed in different colors for easy differentiation. A great ideal clock for old person or poor eyesight people. Extra Large Alarm Clock: 10.4 inch large screen with clear mirror like face, content is easy to see at any angle. Bright, modern, stable, A good choice for bedroom clock or living room clock.