A doorbell rang while you are concentrating on your office work.
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.
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