A doorbell rang while you are concentrating on your office work. You left the work in between and opened the door to a salesman who had got a bag full of unwanted things for you. You went back cursing him but couldn’t concentrate again. If you had already installed an intercom, then you would be able to talk with the person outside and could decide whether you need to open the door or not. Thus you can control the entry of unwanted intruders in your premises. Security is important Intercom systems are must security devices for both residential and commercial buildings. These devices can be installed simply. Audio and video intercom systems are available. It is a safe and secure modular and flexible door communication system. You can ensure the safety of your home and business now.