- The current version of the Kindle is the third generation.
- (The new Kindles to be shipped next month will be the fourth generation.)
- The third generation has wi-fi OR wi-fi AND cellular (3G). This will allow you to wirelessly send the library eBook to your Kindle.
- The second generation only has cellular access. You will not be able to send the library eBook to your second generation Kindle wirelessly. Second generation users need to transfer the Kindle Books from NH Downloadable Books with the USB cable that came with the Kindle.
And transferring titles via USB cable to a second generation Kindle. Or watch this video from Amazon.
This page is also linked from OverDrive's help info for Kindle.