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I found out about this thingy 3 years ago when I had to transfer my PC to my parents' house. Of course, they did not have the right space for it, and I ended up having it in my room which is too far away from our router. So you can imagine that getting a 10 meter ethernet cable to plug it in was out of the question. My PC did not have a wireless card either, so it was a bummer.
Then I found out that you can buy a USB-like thingy that can act as a wireless card, and I was pleased to find that this one was on same for 11 euros. I bought it, and it's been so useful ever since. I always remember to pack it when I come home to my parents, cause if I don't, my PC won't have internet access.
It's the size of a regular USB stick, white and black in color. You take off its cap, and plug it in one of the USB ports of your pc. Then you install the software that comes with it ( a small CD ), and it's ready to use. For me, the signal strength has always been top-notch, and I have not gotten any interrupts, except for the last few days, but I partly blame our internet provider for that. This is the only reason I put 4 stars on this. Otherwise, I believe that it's a great way to be able to connect to any Wifi without trouble.