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Crescendo Alarm - If the alarm is not switched off, the beep sounds at shorter intervals and becomes louder Snooze function/backlight (interval of snooze function is 5 minutes/the light lights up once 10 seconds after manual activation) Negative LCD display with 12 and 24 hour display. *Contrast of the digital display may vary depending on room lighting Compact size, perfect for travel (W 5.8 cm x H 5.8 cm x D 2 cm) Battery: This alarm clock is powered by one AAA battery, but not included.