This is the perfect alarm clock for people who change their alarm settings frequently. No need to advance the clock by 24 hours because you need to wake up at 6:15 instead of 6:30. Just use the top mounted keypad to enter the new alarm setting. Its as easy as 1-2-3, just like the model number. The large 0.9 red LED display is visible from any angle and can be dimmed at night for sleeping. The buzzer alarm has both loud and soft settings and the gentle wake system increases the alarm volume gradually to wake you gently. The battery back up system maintains the time and alarm settings during power interruptions.