The device itself is fairly simple: a small flexible circuit board inside a body that is composed of plastic and can be blown up manually. When not in use, it can be de-flated and folded into a compact size or slid between the screen and keyboard of your laptop when it's closed.
Source: Gizmodo
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//but c-dub, which one is the BIGGEST complainer, there can be only one!
This is a little silly, but having to carry a mouse IS annoying. I've got a small, light laptop, and I often just want to grab it and go, without taking chargers or any of the other stuff VonSkippy mentions (seriously, do you carry all that with your laptop?) If I could just tuck this into my laptop -- and if it worked reasonably well -- I'd consider it.