1. FULL DIMMABLE DISPLAY - The brightness of the 3.4-inch compact LCD is dial-controlled and adjustable from 0 to , from cast-no-glow at midnight to bright enough that the time can easily be read from across the room during the day. Other features displayed on the screen include: day, 12 or 24hr mode, temperature (°F or °C), status and ringtone for alarm 1 and 2. 2. CUSTOMIZABLE ALARM - Dual alarms with separate weekend/weekday/all-7-day mode satisfy the needs of everyone and every family. You may choose one of the 5 built-in tones (Beep/Piano/Buzzer/Bird/Soft Music) or radio as wake up sound, which gradually increases in volume from gentle to the level you set (options from level 1 to 15). Snooze allows extra 9 minutes of slumber. 3. MORE THAN JUST AN ALARM - FM radio saves up to 40 stations, and the sleep timer function (10-150min) the luxury to fall asleep with your favorite station playing. 3.5mm headphone jack comes handy not disturbing others nearby. 2 USB ports will charge your phone or other mobile devices while you sleep. (Headphones and charging cable NOT included). 4. QUICK AND EASY TO SETUP - Unique designed large rotary button as a dial, making setting time/alarm easier and faster. All buttons and dials are clearly labeled with function or icon, and everything is clearly displayed on the screen. So it is a breeze to use right out of the box and change settings. 5. BATTERY BACKUP - AC-powered, but you have the option to back it up with 3 AAA batteries (NOT included) in case of power outage. Not only time and settings are restored, alarm and radio are also supported (USB will not charge). Please be noted that the clock may drain batteries fast, so ONLY use as a backup but NOT everyday operation.