Interactive clickers becoming more popular in K-12 schools

From The Boston Globe: Long used in university lecture halls as a way for professors to better connect to students, clickers--also known as student or personal response systems--are becoming increasingly prevalent in K-12 classrooms. The a 4-ounce devices, similar to television remotes, enable students to respond to teachers' questions and see the answers of the whole class aggregated and displayed on a monitor.