content: I was looking for a wireless doorbell, but stumbled on this product for the same price, which works as a doorbell, and using your cordless phones, also functions as an intercom. Installation and connection was easy - maybe 15-20 minutes, and required just a fillips or flat screwdriver. When someone pushes the button, all the phones ring, with the caller id "Front Door"-our phones have voice caller ID, so it tells you that it is the front door to. You can then pick up the phone, and talk to the person at the front door, or just go open it. When not at home, your answering machine/voicemail message plays through the speaker, so you may want to change the message to include the possibility of someone at your door, instead of on the phone. It runs on 4-AA batteries, and you need lithium batteries if you live where it stays below 20F for long periods.