You mean in two different rooms? Not sure if that is what you mean. But, sure. We had one in each kid's room for a few months, as well as a video monitor in the baby's room at the same time. We had no issues.
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I don't think everything works. We have a video monitor that we use without problems. I was watching a friend's son at our house a while back and tried to use their monitor (in the room next door) and there was AWFUL screeching feedback when I turned it on. I tried to move it around to get it to stop but when it didn't I gave up (to avoid two crying babies).
Yep. We actually have 3. DS has a Mobi video camera w/ only 1 receiver (we keep in the kitchen) and we also have an old Fisher Price sound only monitor w/ that receiver in the basement. And DD has the Summer video with the receiver in our bedroom. We actually have a second camera for this one, but haven't set it up. But anyway, yes, you can do this. The main thing is that none of ours run on the same frequency. The Mobi is analog video, the FP is analog sound, and the Summer is digital.
Re: Running 2 Monitors at the Same time