M.M.
We have the Summer brand TV monitor... we did buy 2 so we could have 2 monitors. I have one on my nightstand and my husband has one on his~ each set to one of our daughters. You can switch back and forth on each, as well as on the hand-held portable monitors. So, if I hear my older daughter on his side, I can switch my monitor and look to see what she's doing, but then switch it back to my younger daughter. Des othat make sense? We have never had a problem with them interferring with each other.