My wife & I have lost some of our hearing & find ourselves yelling to get the other's attention from one part of the house to the other. I'm getting tired of this, so, I'm thinking a wireless intercom sysytem may be in order for Christmas as a mutual present. I'm currently looking at the Chamberlain NLS2 system (4 units), but have not been able to get an objective review via Google. It claims to have a 1,000' range, but has anyone used this system, or can recommend a better system that has clear reception throughout a house (basement to 2nd floor)? Is the plug-in DC adapter really better than the AAA batteries, other than the limited life of the batteries?