This is a replacement keyfob cover for a Foxguard car immobiliser/alarm. Its quite an old model alarm, but the original keyfobs do fall apart.

You will need to adjust either the model, or by cutting/filing the small projection in the lid so that it presses the button on your PCB only when the fob is squeezed. I struggled to get this exactly right.

Model was repaired by "Make Printable" as the original had some odd errors.

I made mine out of PETG its slight flexibility and superior strength seems to suit this object.

When you snap it together it will likely not come apart without destroying it, so put fresh batteries in.