plus : 1 . this be a true atomic clock , none of the factory set wannabe 's . so it set itself from the Federal clock in Colorado . for example if congress scrap the DST in 3 year from now , the clock will correct itself after the rule be pass . 2 . nice led display easy to read in low\/high light . I have another atomic clock in lcd , the lcd clock emit too much light . the current clock be perfect to view . 3 . clear button for alarm & time zone -lrb- CST , EST. . . -rrb- button be minimal , useful and functional . 4 . Lighweight , and use a battery for power outage 5 . alarm volume be fine . I be normal sleeper and have no issue hear it . 6 . for a price -lrb- include shipping = $ 27 -rrb- . well worth the money . the other option be from brookstone etc and way too expensive . negative : so-so look . will not stand out as a cool clock . recommend .