- a) a Kindle, electricity, and access to a file or site with content to view or download; or
- b) a computer, electricity, access to a file or site with content to view or download, and software to view the content; or
- c) a portable device like a smart phone, electricity, access to a file or site with content to view or download, and an application to view the content.
- A book.
And natural or artificial light, if you want to get picky.
I also like to make a fart noise with my mouth whenever I see someone bend over. But that's not even relevant to anything in this post.