There's all sorts of video content available for download to your computer these days, in all sorts of formats. It makes perfect sense to watch downloaded video content on your 32" TV instead of your 15" laptop screen, but not many laptops give you a way of displaying the video output on a HDTV. This product tries to bridge that gap, and nearly succeeds.
You get two USB dongles in this kit, one for plugging in to your PC or laptop, and one for plugging into a little base unit (with a PSU) that has a HDMI (high definition video) output that you plug into your television using an HDMI cable that you need to buy separately (you need a television that has a spare HDMI socket as well, of course).
You install some software on your computer (the latest Windows 7 compatible version is available for download, so you don't actually need the enclosed CD at all), and you can then display anything you can see on your computer on your TV instead (or as well). The audio comes out of the TV too.
You have some choices - your TV appears as a new monitor, so you can extend or duplicate your desktop, or (in Windows 7) you can press <Windows>-P to make your TV work like a projector (this actually means that you switch between displays). Some programs (iTunes, for example) displays full-screen output on your primary display, so one way or another you need to make your TV your primary display.
The wireless connection is short-range, and doesn't work at all through walls.
The output is 720p, which is the lower of the two HDTV standards - fewer lines, therefore lower quality. The quality of the streaming using this device is very good, but it does require a reasonably powerful computer, and it's a bit of a CPU-hog. The wireless does not interfere with Wi-Fi frequencies, so you can watch BBC iPlayer direct to your TV via your computer, full-screen.
The one thing you don't want is technical glitches in the middle of a film. Unfortunately, I have been having problems with this kit. Occasionally the picture disappears for a second or two - and sometimes it reappears briefly on my laptop. This might be a result of wireless interference. More seriously, after about 40 minutes of viewing, the connection becomes unreliable - the wireless connection is lost completely. This may well be a result of overheating - the dongles do get very hot. I have also experienced corruptions on my laptop screen after this happened (thankfully, all was well after a reboot).
Although it's convenient having a few metres of air-gap between the computer and the TV, if having the whole thing wired would make it reliable, it would be worth the loss of convenience.
An alternative to this product - but only for unprotected, downloadable (not streaming) content is the
Western Digital TV HD 1080P Media Player. It may not be perfect, but it does work reliably!