The tie pictured above has a small fan unit inside the knot that blows air around the collar area of your shirt. No batteries needed, the fan is powered by the USB port on your computer. It's one of five air conditioned items of clothing featured on the blog post below: http://www.airconco.com/news/the-air-conditioned-outfit-83.html
Cool cloth ! I also read that somewhere else. Am not able to read whats written on the pic?? I think thats in chinese.
Wish I thought of this idea first, I bet they will make a lot of money from them. Hey I'm buying 1 now