counter watch (counter:side)

A device in the setting of the game Counter:Side, worn by humans who have become Counters.

It resembles an ordinary watch, but Counter watches function differently. The watch behaves more like the Doomsday Clock.
If the time "runs out", the Counter wearing the watch turns into a Shadow, the Counter-equivalent of a Corrupted Object (abbreviated as C.O. in-game).

To keep the watch from ticking down and raise the timer up, the counter must feed the device with a special rare element dubbed Eternium.