This document summarizes research on the use of clickers or electronic voting systems in higher education. It discusses how clickers can provide instant feedback, different question types, and record data to engage students actively. The main areas of research are the benefits of clickers for content transmission, feedback, and student engagement. Clickers are seen as useful for gathering information quickly, recall questions, predicting outcomes, starting discussions, and formative assessment. However, students can experience clicker fatigue and staff have mixed perceptions. Overall, clickers show potential to change teaching practices to be more discussion-based.