All of these wave ceptor analog clocks are hooked up to a 12VDC power rail. And digital clock in the video is generating radio signals to synchronize the clocks to the precise time. And the digital clock is synching the time periodically with a GPS module. In case of a power failure I have integrate TCXO RTC. I have tested these clocks for almost a year, they never miss a second. Pretty amazing digital-mechanical beauty.
Some of my clients hate digital clocks. They specifically order precision analog clocks.