this foldable alarm clock run on 2 aaa battery , and include a light dial , snooze alarm , and 15-minute increment nap timer . it be easy to set and work like a charm . the 15-minute nap timer be programmable for up to several hour , and come in very handy for those `` power nap '' or longer snooze when you need to wake up , but do not want to set the alarm . my previous unit last for over three year of daily use and go on many airline trip and camping trip with I without a problem . the lcd display go out this summer , during a damp camping trip , but for less than $ 9 I be able to replace it . I be expect a good three year from the new one as well . I highly recommend this little travel clock .