"City green" landscape clock. Installed on city streets, residential quarters, green spaces, column-type 2-4 large clocks. Walk in precision, night lighting, timekeeping (optional). After a power failure, the master clock will automatically memorize within a few months, and after an incoming call, the slave clock will automatically track to the standard time, without the need for special personnel to adjust. It can also be determined according to the user's requirements to determine the non-stop time for power outages.