I had given this item a 1 star and bad review because I wasn't giving any instructions of how it worked.  Now that I know how to properly use it I changed it to 5 stars.  The proper way to use it is #1 you need your phone charger to plug it in the small port of the slim port to give it power to display it on your TV.  This does not mean it will charge your phone at the same time too.  On some phone it will charge your device (G4). Now #2 this one is important, you have to put your phone on airplane mode in order not to lose connection from your device to your TV.  If you don't do this video from your phone to the TV will be cutting in and out all the time or won't display it at all.  On some phones it might work without using airplane mode.  But I know that on mine (G4) it won't work unless I put it on airplane mode. Thanks for reading and I hope you enjoy your product!!.. I was pretty close to throwing mine away in frustration. Glad I did not!