What have I inherited?

Hi everyone, complete novice here and hope you can help...

I have just taken over a building that has two Simplisafe cameras mounted on an outside wall along with a solar panel connected to each camera. Model CMOB1.  They were without batteries but I found them and they are now fully charged; the light flashes on the front when I insert them and screw the camera front face back on. I have the App on my phone but I cannot get past plugging in the base station because there isn't one.

But that's it, I have nothing but the cameras and the solar panels, nothing else.

It seems that I would require a G3 Base Station and a keypad?  How can I get these?

Do I need an Internet / wi-fi connection or can these cameras operate without internet?

There is no SD Card so how do the cameras store activity and how can I access it.

Thank you in anticipation.