These are brand new military surplus units that come with all items shown in the pictures. 
They have not been tested as I know nothing about them.

The Classroom Performance System (CPS by eInstruction) brings interactivity into the classroom/lecture hall. It's a wireless response system that gives the instructor and students immediate feedback from the entire class. The wireless response pads are essentially remotes that are easy to use and engage students.

INTERACTIVE....WIRELESS....IMMEDIATE FEEDBACK

   In your class you can:

  • Motivate student preparation, interactivity and active learning - get immediate feedback and know what they understand.
  • Administer quizzes and tests - gives immediate grading!
  • Incorporate multiple choice and true/false questions into your lectures, and get immediate feedback.
  • Use the CPS grade book to manage your lectures and track student comprehension.
  • Establish accountability by giving you an automated way to take attendance.