These radio controlled wall clocks are accurate daily to one second in 10 million years and even adjust automatically during the wintertimesummertime switch to save you the trouble the clocks pick up the official british frequency time signal daily set themselves automatically when battery insertedsilver coloured caseeasy to read digitseach measure 9 in diameterrequire 1 x aa battery each not includedbuy these 2 clocks and save 5