this be my daughter 's favorite clock . she take it everywhere but somehow forget to take it when she go off to school . so , I `` borrow '' it . it be at least 5 year old now and the projection display be go out . it have be wonderful for all these year tho . the battery be a great back up for when the power go out . the only thing I do not care for be that the projector display be upside down when you be lie in bed and there be no way that I can see to flip it .