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Crescendo alarm – if the alarm does not turn off, the beep sounds at shorter intervals and gets louder. Built-in snooze button/light function (the interval of snooze is 5 minutes/the light will light up once 5 seconds after manual activation). Quiet precision quartz movement (latest generation). Illuminated hands and characteristic yellow second hand. Battery: This alarm clock is powered by one AAA battery (not included).