Support for Indie Authors discussion

I am looking for opinions on my book trailer. I have never done one before so this is new territory for me. I don't know how to embed the video so I am posting my dropbox link. I hope that is OK.

https://www.dropbox.com/s/aaovkfu18p8...

I have never seen a book trailer before and do not understand their function, but I liked yours. The music and visuals were peaceful and served as a nice background to read the story synopsizes.
I didn't see an action click-button though. A website or link to where I can buy the book.

The book isn't out yet. I am making last-minute preparations. It won't be out until June 16. I had someone to make this for me and I wanted to get opinions before I excepted it. Since I am blind I can't view it for myself so I have to ask others.

Also I wanted to add a book trailer is for promotional and marketing purposes.