Just under 6-meters is a common frequency for older baby monitors *AND* cordless telephones. I had both well within range. It only took telling them I could hear them as clearly as I could while we were talking and both were replaced the next day. I took the informative approach: "I just thought you might like to know I can hear everything you can hear on the baby monitor or anything you say that it can pick up." and " I thought you'd like to know I can hear every word you say on your telephone so any one else in the neighborhood could too". I think it would be unusual for new devices to show up on that frequency range. When most people find everything they say in range of the device(s) can be heard anywhere in the neighborhood, they are quick to replace them.