have the Canon RC-6 wireless remote controller very quickly received (22/08/2014). Unfortunately, this was inoperable. The battery was inserted and probably empty!?. I have received the remote release on 23/08/2014 at Amazon but returned neither substitute nor an answer until today. Pity, because I like to have shopped until today on Amazon. It is possible that I have caught one returns, but that does not help me further.