A.D.
That was my dilemma not having a monitor is not an option in our house because our h-vac system is right outside our bedroom door. It looks like some people have had luck with the channel switching thing but I ended up just getting another monitor, the Sony 900Mh Baby Call - this one has several channels to switch, I figured it would be easier to find something without interference with several channel options. There is a Graco monitor out there that has 2 child units and 2 parent units, but most reviews said it didn't work very well.