The mechanism of quartz clock, based on the phenomenon of piezoelectricity, is one of the most energy-efficient, for a reliability of a 1 second discrepancy over a 6 years running period. With the strong magnets it easy to fix it without previous installation onto any metallic surfaces. Conventional style: protection of the outlines in plastic, standard diameter (30.5 cm) and outlines with hours/minutes marked out with Arabic numerals so that it is easy to read.