I believe there are 2 Roger X slots per aid, one for (02) and the other for (03) licenses, but somehow I managed to put 2 x (02) licenses into my right aid, severe panic set in, if I recall at the time, I thought maybe I had bricked the aid! To explain, I had installed the first type (2) on the right aid, but not thinking, I never switched it off, and just laid it on the table about 2 foot away, you are meant to lay the aid on top of the installer or within 4 inches I believe? Checking the other Roger X prior to installing in the left aid, fired the the installer up, green light so I was good to go, the next thing I see is the Roger installer flashing green prior to me switching on the left aid, meaning it was in the process of transferring the license, I then noticed the right aid was still switched on, so I now had both (02) licenses in the right aid!!! But it uninstalled no problem, so panic was over