I can't say for certain -- I think there are multiple monitor/single receiver units out there, BUT

I got one for my sewing room a few years ago. My machine is cool. It works by itself, and I can wander off to other parts of the house and forget about it, but then I get nothing done. So, the monitor. Anyway: my girls had no secrets when I was monitoring my machine! Didn't matter if they were in their bedrooms or the bathroom, and I could even keep an ear on the laundry room. That bugger does a lovely job of listening in on about 1600 square feet for me, all for about $25!

(some day, my son in law might figure out that they don't have to be within inches of baby to pick up baby sounds!)

Karen in Boise