A quad is an accessory to your surveillance system that splits a video monitor into 4 screens. Without a quad you would only be able view one camera at a time. A quad is only needed when you are using more than one camera and using a VCR or VISEC to record or when you are only monitoring and not recording at all.

The quads are high resolution real time quads that support up to 4 cameras. You also have the ability to playback and zoom in on recorded video. There are other products out there that can split a screen more than four ways. However, video quality worsens the more ways you split a screen. A quad is not needed when using a DVR to record because DVRs have a built-in quad. Below are two examples of how a quad works:

This is a surveillance system that is monitored only:

This is a surveillance system recording and monitoring:

4 Channel Color or Black & White Quad
- QD-104 Black/White 4 Channel Quad
- QD-904R Color 4 Channel Quad

Features include:
- Full duplex allows transfer of recording and playback video at the same time.
- 2x2 zoom
- 60 frames per second
- Real time clock
- Title generator
- On-screen display
- No boarder for full quad display
- 2H adaptive comb filters for Y/C separation