This article discusses pre-service elementary teachers' feedback regarding an implementation of a personal response system (clickers) in their mathematics course. A modified peer instruction model used clickers as a preliminary to class exploration of mathematical content. Classes of approximately 30 students included six lessons that were enhanced with clicker questions. Most students expressed favorable perceptions of the clickers and clicker lessons. Students felt that the inclusion of clickers helped them to better learn and understand course material, with most identifying a mathematical topic for which they attributed a better understanding to clicker lessons.