If you use the MOBI Digital Doorphone to see who's at the door before you open it, you can expand this wireless video intercom system with up to four additional cameras. The Additional Camera for MOBI Doorphone is a wireless color camera that transmits to the LCD monitor (sold separately) inside your home, so you can see and converse with visitors before deciding to open your door. This digital wireless video doorphone system provides clear two-way audio communication up to 300 feet and even comes with a door release button on the monitor to operate an electric door latch (sold separately). # Door phone camera # Power adapter and cable # Mounting hardware # User's manual