At one point, Jobs escorted singer/songwriter KT Tunstall (who performed at the Apple event) and Starbucks (SBUX) Chairman Howard Schultz through the demonstration room. In the video below, Jobs is explaining Bono’s Product Red campaign, in which companies sell red products and give a portion of the profits to fight AIDS in Africa.

The audio is difficult to decipher, but if you listen closely you can hear Jobs explaining that Apple is the second largest contributor to the Product Red campaign, and about $10 from the sale of every Red nano goes to the charity.

[youtube=http://www.youtube.com/watch?v=vB-Ymc-cadI]

Here’s a rough transcript of the conversation:

Jobs: Check out the nanos. This one, we do this one with what Bono is doing … we’re actually, I think, the second-largest contributor.

Tunstall: That’s amazing.

Jobs: It’s good.

Tunstall: How do you get all of that …? It’s fantastic.

Jobs: A lot of people want to do something, but they don’t know what to do. So what he’s trying to do is have companies come out with Red products, so if you want to do something, you can just, by your purchase choices, they don’t cost any more, buy one of those and then … we’ll give some money. Like, we give 10 bucks every time someone buys one of these.

Tunstall: It’s so nice to have a choice in the whole thing.

Schultz: It’s fantastic.

Jobs: Yeah, actually, the video is pretty cool.