From the picture it looks more like he stripped the electronics from an existing clock and put them in a metal case. If so then he did not create anything.
Electronic clocks do not require that size board. It is not a clock, though there may be a clock circuit on it as well as a clock display output.
Probably has some switching outputs that can switch several relays, and a built in wireless communication function, with both transmit and receive.
It was a setup, and made to look like an IED trigger.