Question about Motorola Set of 2 Talkabout

It all depends on what signal you are communicating. My daughter has communicated with our neighbour‘s daughter who has a completely different brand and model. You set your frequency and can communicate with anyone on that signal in range. We have had a few funny surprises.

Yes, that works. Select the same channel. Should work with an almost unlimited number of radios.

I have no idea.