You might have seen those beautiful wood alarm clocks with displays that peer through the wood in the front. That was the approach here, with the addition of Janine’s “WE GOT ONE” button on top that functions as a snooze button.
The red light and alarm bell (which is just for show, I’m not that cruel) flank the time display. These look like the ones seen on the wall in the film, right after Janine pushes the button. Only difference is an LED light instead of a light bulb.
The green display represents ghosts or ecto slime. I’m sure a Ghostbusters logo could be slapped on here somewhere, but I like the minimalist approach of those aforementioned wood clocks. In fact I’m a little worried I cluttered this up too much.