Master Slave Display Clock is an electrical device that sends time synchronization signals to a network's slave clocks. The master time clock often maintains exact time from a hardware clocks source, such as GPS, Galileo, or other precise time sources. The clock network might be as basic as a cable serial network, and as complicated as an Ethernet network. Master Slave Display Clock is a piece of hardware that normally relies on a master clock to keep precise time. Typically, slave clocks interact via a clock network.