How can this be considered wireless??? Help, please!!?

(I know the question' looks long, but it is pretty straightforward.)

I am speaking of wireless security camera systems--the multi-screened (divided) ones in particular.

(Are there any professional installers out there? Are anyone with a working knowledge/has set up a system before.)**

The company--at the link below-- states that this is a wireless system, that it is "Cable Free..." (As do many), but it also boasts that you don’t have to bother with cabling to the DVR like you would with other companies’ products. (That claim almost cost me a pretty penny)

http://www.ebay.com/itm/Zmodo-Wireless-IP-Indoor-O...

Check out the video at the 3-3:30 minute mark, then again at 4:30-5 minute marks. Make sure you can read the instructions at the bottom of the video.

1--Ooo--kkkk…but watching the video, am I not having to cable ‘everything’…uhhh…to the router???

(That's what it looks like to me)

2--What point am I missing!??

----I thought wireless meant...you plug it in, turn it on, and it starts transmitting.----

(The cameras. I assume the DVR would have to be wired)

But assuming there is no escaping the cables... :/

3--Would I be able to cut into (tap off of) the cameras’ AV wiring in order to get a signal to the computer screen, and, to a separate monitor?

4--Would that get me a weak signal/scrambled signal/no signal at all if I did that?

I ask because I worked for a satellite company a few years back and if a customer tried to split the signal from a single cable, they were not happy with the results.

Anywho--this is what I want--ideally.

One WIRELESS, 8-camera system that I can monitor from my computer and phone...BUT...also from a regular monitor set up in my bedroom. (That way, if I hear something after I go to bed, all I have to do is open my eyes and look).

5--Please...How would I go about that?