content: At first, I thought this was the greatest thing I could've bought for us so that we could hear the doorbell upstairs. Well it was, for about two weeks; for the it worked. It pretty much has a mind of its own. It works when it wants to (new batteries or old). Sometimes, we will hear the thing go off and the doorbell wasn't even pushed. Use your money on a different extender. Normally not a negative person but I gave this item one star because there was no option to go lower. If I could, I would give it 1/16 of a star...just for working for two weeks. Piece of junk!