The G55BAAG191-WEB Synchronous-wired corrective clocks are used with the YMP series or AllSync master clocks to provide continuous accurate time indication. The secondary clocks are provided in round only, high impact black plastic cases with polycarbonate crystals and bold, black numerals and minute markers on a non-yellowing white dial. Stylish hour and minute hands are aluminum with a black finish and a red sweep hand. Other bezel colors available. Consult factory.