Used in lectures (usually), these voting handsets can get everyone in the room to engage and interact with each other. Typically a question will be asked and you can respond with your voting handset. They may be used for revision, debates, polling the audience, team competitions and peer assessment.
Your lecturer will inform you if they'll be used and often they will provide the voting handsets on the day. Some groups may have their own, and some students may even have one all year for regular use.