Crescendo Beep Alarm & Snooze - Gradual crescendo of beeps that increase in frequency and volume if you do not turn it off. Snooze interval is 5 minutes, and the integrated light illuminates for 5 seconds so you can easily check the time (once manually activated.) Easy Settings Adjustment - The rotating bezel is used for quick setting of the clock and alarm. Turning the bezel clockwise advances the time, turning anticlockwise retreats it. Clearly Visible Display - Easily legible thanks to the reverse LCD display, offering both 12-hour and 24-hour options. *Display contrast may vary in different lighting conditions. Dimensions - W7.8cm x H8.0cm x D5.0cm Battery Efficiency: This Clock requires 1 x AA battery to operate however this is NOT INCLUDED. For optimal performance in timekeeping, backlight, and alarm functions, use only NEW ALKALINE batteries.