It is extremely light weight. The one I have is powered by a USB block. You can get assorted grit drums for the sander. They also have models that are cordless for a bit more. I highly recommend this little device. The arbor shaft size is not the same size as the dremel tools, just for your information.I can see many uses for that tool. I find my dremmel too powerful to sand things like this, even though it has a variable speed.
Rob