My K4 NT (graphite) was delivered yesterday. I've been reading and experimenting non-stop since then

. I'm quite happy with the product but have these questions:
- Model No. is D01100. How can I find if it is with or without offers?
- I am reluctant to register since I do not intend on buying books from Amazon. I want to read free books from sites like gutenberg.org. Registration may bring ads, but without registration all the settings will not become available. What can I do to fix this?
- Strangely, there was no manual preloaded. Where can I find it?
- What do the two small conductors/lugs at the lower back do?
Thanks.