I would be helpful for you to show us and guide us on how to do the wiring. And also tell us what you did wrong when the green light didn't come on the first time, so we could know what to do to fix it if the same thing happens to us. Now, I'm stuck on the wiring part.
I installed it on the ceiling and then tried to practice unplugging the quick connect plug. It was so impossible to unplug that I had to undo the wire nuts to disconnect it from the wires coming from the house. With the detector disconnected ftom the wire harness, I still could not unplug the quick connector plug (while pushing down on the small tab). The design of the smoke detector is terrible.