[xinseo]

 Which key on this remote do you press to put the shield in listening mode? 

There's a mic button on the bottom right corner. 

 There's no mic button on my remote, or that I can see in the ebay details

There are 2 models of the T3 from what I can see. T3 and T3M with mic. I'll let you know how it goes once i get it.