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[ame=http://www.amazon.com/s/ref=sr_kk_2?rh=i%3Agarden%2Ck%3Aatomic+wall+clock&keywords=atomic+wall+clock&ie=UTF8&qid=1351992249]Amazon.com: atomic wall clock: Home & Kitchen[/ame]  Here is a link to a lot of atomic clocks which are the ones that change by themselves.