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Sharp Atomic Clock Spc373 User Manual [2021] -

: Upon battery insertion, the clock enters reception mode. It may take several minutes to several hours to capture the atomic signal. Expert reviewers at JustAnswer

: The clock may take up to 24 hours to catch the atomic signal. For the best reception, place the clock near a window overnight. sharp atomic clock spc373 user manual

Press and hold the button for 2 seconds until the hour flashes. : Upon battery insertion, the clock enters reception mode