An atomic clock with a convenient automatic light function that makes it easy to read the time even at night. Calendar, temperature and humidity display are multipurpose. Standard radio wave clock. It receives radio waves with accurate time information, Clock automatically corrects display time. When using Place it on a window that is as easy as possible to receive radio waves. Avoid the location where radio waves are generated. When no radio waves are received, it is powered with quartz accuracy. ● In addition, the reception may not be able to be accurately recepted in the following locations, Please be aware of Inside buildings, cleavages and basements Close to high pressure lines, TV towers, and train rails. TVs, refrigerators, air conditioners, air purifiers, computers, fax machines, etc. Close to appliances and OA equipment For construction sites, near airports, and places with high traffic, Where there is radio interference In vehicles. (Automotive, Train, Airplane, etc. ) Close to other objects that generate radio waves noise. · Over or near metal furniture such as steel desks The reception may be possible depending on conditions outside of the area where it can be received.