Audience Response Systems (ARS) are not new in Teaching and learning. Old day we used cards of different colors and Letters.Than comes clickers with hardware and software. To read more about non technological ARS click here
The new hi tech ARS many but I am using Poll Everywhere with no hardware your mobile smart device could act as clickers you may need internet if internet is problem audience could use SMS to response. Details about Poll Everywhere click here
Here is the slideshare of my workshop on Poll Everywhere at IMU.
Another more collaborative and formal setting of ARS is Socrative. One of the Comments about Socarative by Charlene Patten “There is a really cool app called Socrative that can be downloaded on Android device, Apple devices and through a browser. This tool allows for students to use their mobile device as a clicker system. The best part about it…its FREE! ”
To know more about Socarative click here