this clock be great for shift worker . another reviewer mention that tap the snooze button more than once multiply the user define snooze time by the number of tap . that be a nice surprise that I do not read about in the instruction booklet . the battery backup be nice in the event of a power outage . however , my old clock would keep track of the time internally and still sound the alarm -lrb- even the radio -rrb- at the correct time with no ac power apply . this clock save its setting but will not wake you if the power be off when you alarm should sound . as be mention in another review , the backup battery holder be cheap and oddly support . this force I to re-enter the setting the first time I move the clock . a wire on the holder must have be over the battery contact . I bent it away and it seem to retain the setting now . there be room for improvement but this be the first of its kind and it do what I need it to do . maybe the upcome `` Executive '' model will address some of these thing . regardless , I be happy with it .