A video door phone ( as called "video intercom system") is one perfect safety device for your home, allowing you to see and communicate with vistor who is in front of your door,  however you do not need at the door ( stay your room or hall or kitech OK) or have to open the door.  you can finish everything well on indoor monitor.

Do not need communicate face to face to avoid awkward and unexpected danger from stranger or criminal

After you come back to home, you can review photos on this monitor and know who come or visit your home when you are outside

usally this system have at least one indoor monitor and at least one outdoor camera, the visitor press and ring the button
on the camera, then indoor monitor will ring and his/her photo and video will transmit to indoor monitor for viewing.

They can work with wired connection or wireless connection available, The image and video can be Colorful or Black/white,
If you have more doors or rooms, you can fix more monitors and cameras together.

Currently the size of monitor have 2.5inch, 3.5inch, 4inch, 5.6inch, 7inch and 10.4inch, 7inch is most popular.

The installment of wired video door phone is even DIY and not complicated, you do not have to ask for specialist or hire professional worker.

No need installment of wirleness video intercom in your home, you can put indoor monitor anywhere freely