The connection is NOT 3M proprietary, it is mini hdmi. So if you want to use this to get your iphone 3Gs and earlier phone to a projector/television that accepts mini hdmi, you are all set. However, if you were hoping this would work with 3M pocket projectors as the package states, I can tell you the MP220 does not accept mini hdmi. I know this since I had to write 3M to find out and they have stated it is a proprietary cable connection that they no longer manufacture...way to take care of your consumers 3M!
I was disappointed and returned the adapter when it would not work with the iPhone 4s or iPad 2 or newer. I says on the box it works with iPhone 4 and older and iPad (I assume the first generation) Don't have an iPod to try it with.
Just got my 3M Pocket projector last week. It came with the Dexim ipod cord kit. I call it a kit because it has an adapter and two cords. The adapter has a 30pin connector to plug into your ipod or iphone and the other end of the adapter has a Micro USB port and a Micro connector port. The micro USB port lets you charge your ipod (micro USB to USB cord included for that) and the Micro connector port lets you connect your ipod to the 3M projector. The necessary cord for this connection comes included as well. With the ipod connected to the projector you can display photos from your ipod or play .mp4 movies from your ipod. You can also play videos from the Youtube app on your ipod, assuming you have it (which you should as it's usually standard on the ipod/iphone). Do not expect to be able to enlarge the photos and see that displayed by the projector. It doesn't. ( I really wish Apple would make the necessary changes to make that happen!). Don't expect to be able to use Safari either. I tried it. Nothing.