Guys I have a question.

I currently have a PCH but will get another one shortly..

I am planning on getting 2 of these extenders..

But how can I make sure that when I am controlling the devices downstairs, the upstairs extender wont pick up the signal and start changing things on the device upstairs?

I don't see anywhere in reviews or instruction online on how to operate more than one of these things.

You could buy one that uses 433mhz and the another that uses 418mhz.