4.3 inch wired Audio/Video Doorbell Answering System 1-Camrera 4-Monitor. 

The display image is very clear with 4.3" high resolution colourful TFT LCD and IR camera. The clear picture will surely satisfy your requirements and the camera is 700TVL, which will enable you to see clearly who is at the door.
The camera mounted at the outside of the door allows you to talk outside and the people at outside can also talk to you.
This 2-way communication is an inexpensive and effective way to talk with the stranger at the door without actually opening the door.
Surprise visitors can be great, but they're better when you can decide whether to greet them, before you're at the door. you get a home phone doorbell for a convenient connection to your front door
You can use these network cable. But, the total length cannot exceed 30m.

Monitor
4.3" high resolution color TFT LCD.
Collocation telephone set panel,fashionable and luxurious.
Compatible with electronic door lock.
Intercom between handset and camera.
One camera can be connected to up to four monitors.
Easy installation and reliable, its appearance is beautiful.

Camera
High resolution 700TVL CMOS Camera.
View angle: 92 degree, Dual-way intercom. Power Supplied by indoor monitor DC 12V.
Compact design and Mini size Easy to install.
ABS Plastic,Aluminum wire drawing.