I buy this clock for my parent and they love it . its feature be that it have a beeping alarm that gradually get louder , a adjustable green backlight , a blue light that illuminate when you push down on the snooze button , and a simple wind operation for the hour\/minute hand and the alarm . it take 3 aa battery . the only problem with ours be that after a few hour of work normally , the hour\/minute hand freeze up . we could still turn the knob to set the time , but then the hand would not turn automatically . we send it back for a new one , so hopefully that one will be fine .