The Tag School Reader is a handheld tool designed for students in PreK-3rd grade. You use the tag reader to read specially-printed books by touching the tag reader to the book. It can read a whole story or just certain words. You can also place it over the pictures for more information about the story. There are activities to go along with the story after finishing the book that focus on comprehension, phonemic awareness, phonics, and vocabulary.
I think this sounds like a great tool to use for a literacy center during guided reading. This is something that students can do on their own to either listen to a story and have help reading the story. This device also comes with headphones so it is not disrupting to other students.
Image from: http://www.leapfrog.com/school/prod_pages/common/Tag_School_Reader.jpg