I installed it without an extension cord, the installation was easy. I thought it wasn't the strongest, but thought it would be better than the trick with an old piece of wood in the door rail. It was about a week before I found myself locked inside the house and decided to check the latch and give it a little nudge while my wife went home to let me in. Let's just say with very little pressure. The locking mechanism broke and I was inside in less than 10 seconds. I would get it if I had to really try and work to get in, but it was awfully easy. In general, I like the idea, but it's too weak to be called reliable.
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