The Send to Kindle Button enables your readers to send content to their Kindle devices and apps to allow them to continue reading later.
◾Readers can send posts to multiple Kindles at once.
◾Posts can be saved in the cloud and accessed anytime, everywhere.
◾Configure how the button will look and which page types it will appear on.
◾Use the shortcode [sendtokindle] to place a Send to Kindle button anywhere.
More information about the plugin can be found on the Send to Kindle WordPress page.