The general topic of the paragraph is how ebook readers help students. Does the paragraph have a topic sentence?

eBook readers are excellent devices for students. Reading eBooks is just like reading a normal book without having to hold the book or turn the pages. These devices save students energy. Before eBook readers, students had to carry many heavy books with them each day. However, eBook readers are extremely lightweight and usually weigh less than a pound. eBook readers are more efficient and convenient than a regular book. They are wireless, so students can use them anywhere. They are comfortable to hold and are clear even in bright sunlight. My friend has an eBook reader, and she convinced me to buy one. Finally, purchasing a new book for an eBook reader is simple and cheap. There are now millions of eBooks available, and many eBooks cost less than traditional books. It is clear that eBook readers have certainly made students' lives much easier.