This plastic-framed wall clock measures 14 in. in Dia and looks most at home hanging in an office or business setting. However, this clock's claim to fame is its precision time-keeping and the fact that it never needs to be set. The clock has a built-in antenna system that receives signals from the WWVB radio transmitter in Fort Collins, Colorado, which is in turn is regulated by the atomic clock. Once you install the battery and choose one of four U. S. time zones, the clock automatically sets to the accurate time in hours, minutes, and seconds, and continues to adjust itself 9 times daily. This low-maintenance clock even automatically adjusts for daylight savings time, so you never need to remember to spring ahead or fall backward. This radio-controlled clock is covered by a 1-year warranty, AA alkaline batteries (not included).