Difference in Dual Source vs Single Source Wireless Headphones

[ski_mom]

We are having a DVD player installed in our car. It comes with one set of Wireless headphones and we'd like to get a couple more sets so each kid will have one.

Anyway, the installation place wants to know if we want the dual source (which run $50 each) or the single source ($20 each). I don't see a lot of difference in the two of them, but wondered if anyone has experience in them.

The installation place said that the more expensive ones have the noise cancelling feature, but I don't see that listed anywhere. We will talk to them about it again tomorrow morning before letting them know for sure which ones we want, but just wondered if anyone has any first hand knowledge about them.

Here are links to the 2 we are considering:

dual:
http://www.crutchfield.com/p_500SHSN205/Alpine-SHS-N205.html?tp=3271

single:
http://www.abt.com/product/40532/Alpine-SHSN103.html

I know the prices are a little different on the websites, but that is what we will get them for from the dealers.

Thanks!
Becky