…FYI. I found this one on Amazon for just a few dollars more:
http://www.amazon.com/clicker-Remote-month-Polling-Access/dp/1498601634/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1439593930&sr=1-2-catcorr&keywords=iclicker+2
A number of classes allow for the online version of clickers. That’s what we did in my intro to computer science and physics classes.