Video Door Phones find uses at homes and at places where security threat is high. They are an upgraded version of simple door phones or intercoms that were useful only for audio communication. Video door phones are fitted with cameras to let you see the face of the visitors and help you decide whether they should be allowed to enter the gates. Video door phones are installed at the entrance of your home and help you speak to the visiting persons without coming near to them. Your home is thus safe from unwanted people and probably, their malicious intention. Some video door phone systems are equipped with features that allow you to transmit signals to the security systems for quick action in case of emergency.