[sp332]

If you click on the picture, it takes you to a Flickr page with a caption. They're Astro A40 BXR's http://www.astrogaming.com/a40-headset-bxr-edition

[sgarman]

They(Astro A40) are used widely for console tournaments (like halo and call of duty). You can daisy chain them to create voice LANs for your team.