Good Gear Guide
In pictures: Belkin ScreenCast AV4 Wireless AV-to-...
The ScreenCast AV4 has two units: the transmitter, and the receiver. The device in the picture is the receiver and it's hooked up to a TV using a single HDMI cable (an expensive one by the look of it). It grabs the wireless stream from the transmitter, which sends the digital signal from an HDMI device over the 5GHz frequency spectrum.
In pictures: Belkin ScreenCast AV4 Wireless AV-to-HDTV Adapter