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Swelling Alarm Beep - The alarm signal will sound more frequently and louder if you do not turn it off. Snooze/backlight function (the snooze interval is 5 minutes/lights up for 10 seconds after manual activation) Negative LCD display with options for 12/24 hour display. *The contrast of the digital display may vary depending on the room lighting. Compact size, ideal for on the go (W 5.8 cm x H 5.8 cm x D 2.0 cm) Battery: This watch requires one AAA battery, but not included.