Clocks synchronized by a publicly available time reference, such as DCF 77 (German time signal transmitter), or the globally available GPS (Global Positioning System). These clocks do not need any connection to a master clock.
Power supply either by mains or - if feasible - by battery....Continue Reading.
Clocks synchronized by an on-site time code transmitter.
No installation for the time distribution necessary. Unlimited number of clocks controlled by a single transmitter.