The blink has an indoor controller, that stores the videos, it needs wifi and a plug. It sends the clips to your email almost real time, and you can watch live if you want. The ring has a card, but it also sends the clips to your phone/pc via wifi. My two daughters have the Ring system, I have the blink system monitoring the entire house, in and out, it is scheduled to automatically go on when we are at work but can be activated manually via the app.