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Welcome to our store buy more products: 7 Inch Color LCD Video Door Phone with 1 Camera + 1 Monitor 7" Color Video Door Phone Intercom With 700TVL CMOS Waterproof IR Sensor Camera 1 X 700TVL CMOS Waterproof Camera + 1 X 7Inch Color LCD Monitors How to handle a situation when someone (a stranger) is knocking on your door ?It happens to all of us, sometimes regularly depending on the neighborhood. But if we hear an unexpected knock on your front door. The question is, what should we do ? Normally, we will do below things:1. Open the door directly (It is not the best idea if you do not know who is outside. Obviously if you know it is the trusted person, then you can.)2. Look out the door\'s window (if it has one) first to see who is knocking, if you don\'t recognize the person, you could ask through the door who they are and what they want. But the main thing is, it\'s best to look first, before blindly opening the door.<
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