Its a regular email app with the additional Audio Book feature:
Find your favorite short story on any web, cut/past and send it to your Email+ and you will be able to read and listen to the story page by page.
1) From main email list screen, touch the right most gray speaker icon to open the email in audio book view (You need to open an email with more than one pages to see the In-App Purchase popup).
2) From the audio book view screen, touch the upper right blue speaker to listen to the email voice reading (Touch the blue speaker button again will stop the voice reading).
3) It will automatically turn to the second page after finish voice reading the first page, you may swipe from right to left, tap the right side of the screen or use the first slider to turn to next or other page.
4) The In-App Purchase screen will popup once you are on page other than the first page.
5) Touch the blue Purchase button to make a purchase.
6) The In-App Purchase screen popup go away forever if the purchase was successful.
7) You may flag the email as audio book by touch the left most gray flag icon, the email will be move into Audio Book folder.
Regular email features:
1) From the main email list screen, touch the email in the middle area to open the email in normal html view.
2) From the main email list screen, you may swipe from right to left to delete the email.
3) You may compose new email or reply email.
4) Pull down to check new email. New email check within 90 seconds since the last check will be ignored.
5) Automatically check new email in the background at an interval of about 10 minutes.