Sennheiser's Duo Cinema

I know that Sennheiser has an ever-expanding line of wireless headphones, and I've seen these at CES. Something I haven't seen before, was a package labeled Duo Cinema. This is a kit that includes two sets of HDR 170 wireless headphones and a base unit, for $599.95. These are intended to be used for home theater; the base unit can accommodate two more sets of headphones. The Duo Cinema package is available only in Canada—so no wonder I didn't see it at CES. It's shown here by Nadine Girard- Business Director, Retail Strategy of Sennheiser Canada.