Mysterious Xbox360 Accessory

I was just watching This Video over at Team Xbox. The video shows off some of the 360's accessories. The video features several accessories rotating around a carousel and it stops to cover them individually, but there is an accessory on the carousel that is not covered by the video or that I have seen before.



Additional: This mysterious accessory also does not appear on Xbox.com's Accessory List.

Additional: Turns out that it is a battery recharge station.