Worldwide location tracking system gps satellites gps clock, Which contain highly accurate clocks transmit time signals to earth. The gps receiver, Which can easily be mounted in a window, Picks up these time signals and sends them for the expert transmitter located inside your premises. This receiver sends the temporal indicator to the location finder wireless clocks throughout the facility. You can have any number of such synchronized clocks with one such receiver. System never, Once set requires manual adjustment lcd and led displays for clock time indicator light to indicate receipt of synchronized time signal. Selection of alternating time along with the date. 12, 24 hr format. Battery back up option available tone generator to produce scheduled tones for giving bell or announcement.