You can use your existing SMART Response clickers (LE, PE or XE) for assessments as long as you stay on your current version of SMART Notebook. SMART Notebook 16.1 and later versions will not support SMART Response clickers.
This change was made because, with the increasing trend of student devices and BYOD, we are seeing declining usage of dedicated clickers. Also, standardized tests like PARCC and Smarter Balance are already offering technology enhanced questions that require more interactivity to complete than simply selecting an answer option for a multiple choice question. Having a device-based assessment solution gives teachers flexibility to experiment with richer questions to engage their students.