Crescendo beep alarm - The beep alarm gets more frequent and louder if you do not turn it off. Snooze / backlight function (Snooze interval is 5 minutes / Backlight illuminates for 5 seconds once manually activated) Continuous backlight function illuminates the dial when in a low-light environment. The unobtrusive backlight means the time can easily be read at night. This feature can be disabled. Quiet precision quartz movement (new generation) Luminous tipped hands + iconic yellow second hand The Braun BC22 clock requires 3 X AA battery to operate however this is NOT INCLUDED. For optimum performance of the clock time keeping, backlight and alarm, we recommend using ONLY NEW ALKALINE batteries.