I haven't personally used it but from what I have heard, it's not really useful. The one I have heard about beeps or does something when the baby doesn't move for a certain amount of time, which when a baby is sleeping, they're sleeping pretty good. So it ends up beeping constantly. But like I said, that's only one certain kind. I'm sure there are better ones out there.
I have a video monitor and they're great!
at 8:15 PM on Feb. 16, 2010