Kindle is one of the most popular Amazon products that people use to read their favorite books. However, despite the fact that the app has spent a considerable amount of time in the spotlight, there are still some surprising facts that many people don’t know.

Number One: Kindle Lets Users Lend Books. Just like in a real library, Kindle users who want to “lend” books to their friends or family can do so on a one-time basis. The book will then be made available to the friend or family member for 14 days.

Number Two: It Can Be Used as a Music-Listening Device. If you like to listen to music while you read, then you’re in luck! The headphone jack on the device isn’t just for listening to audio books. Users can copy MP3 files to the device and put it in a separate folder.

Number Three: Prices Differ Depending on Where You Are. If you’re in the United States, you might be paying more (or less) for a book than someone else in Australia. The prices of the books the app offers vary depending on where its users are.

Number Four: It’s a Secret Camera. Most people think the camera on the device is just for using Skype, but in reality, it can be used to take pictures as well. However, the camera is front-facing, so logistically it’s not the easiest thing to do.

Number Five: It Lacks Privacy. The device collects all sorts of information about the people who read Amazon e-books (it’s unclear if it does this for other e-books as well). Not only will the device have access to the user’s identity, but it also collects data about the last pages of books read, how much time is spent on each page, and which passages are personally highlighted.

Number Six: Kindle Lets Users Play Games. Your Kindle isn’t just for reading. Regular devices offer users the option to play Minesweeper and GoMoku. If you want to play Minesweeper, simply hit “Alt,” “Shift,” and “M” at the same time.

Number Seven: Kindle Offers Thousands of Classics for Free. In fact, the app offers an impressive 8,000 free ebooks for its users. There are several different resources for the app’s users to access free ebooks, including Project Gutenberg and Centsless Books.

Number Eight: The Company Refuses to Release Sales Information. Despite the insane popularity of the device, there isn’t any sales information about it. However, Morgan Stanley has estimated that the sales of the device totaled up to $5 billion in 2014.

Number Nine: The Kindle Can Read to You. You can use your Kindle to have it read to you just by turning on the text-to-speech option. However, only certain publishers allow this, so the option isn’t available for every book.

Number Ten: It Won’t Eat Up Your Cellular Data. For users who have the Keyboard 3G, up to 50MB of cellular data is made available the low cost of nothing. Both the Kindle Store and Wikipedia are still accessible after the 50MB limit, too.

Number Eleven: The Name Is Meant to Inspire Excitement. The word “kindle” means to light a fire. The Kindle was named with this in mind, and its creators wanted people to hear the word and use the device as a way to “light” a fire of intellectual excitement.

Number Twelve: College Students Can Use it to Rent Textbooks. Many college students struggle to scrounge the money together to afford textbooks. However, the company allows students to rent textbooks, effectively saving the students thousands of dollars.

Number Thirteen: If You Jailbreak It, You’ll Still Be Under Warranty. Several websites have listed instructions on how to jailbreak the device. While jailbreaking other electronic devices usually voids the warranty, this isn’t the case with the Kindle.

Number Fourteen: It Helped Amazon’s E-Books Surpass Paper Book Sales. In 2010, Amazon sold more e-books than paper books for the first time ever. This was incredibly revolutionary and helped the Kindle’s developers gain confidence in the fact that they were heading in the right direction.

Number Fifteen: It’s Missing a Lot of Bestsellers. Specifically, several publishers opted out of being included in the Kindle Unlimited library. These publishers include Hachette, MacMillan, Simon & Schuster, HarperCollins, and Penguin.