Read Up Folks. Charlie has fooled you all. There is nothing around the cat's neck. Charlie has never spoke with the company nor has he tried the product. The product comes with a harness. I got this response when I wrote the company. They should show more pictures of the harness.

Thank you for your inquiry of the Backyard Cat. A product that is Veterinary tested and Animal Humane Society approved.
The cats love being outdoors in their own fenced backyard.
The Backyard Cat is a training device which includes a long lead, a harness, and the Backyard Cat weighted bag.
Please note, A HARNESS Is used, nothing is around the neck.

First your cat will get used to the harness.
Second, you walk around with your cat in there own fence backyard with the longer lead.
Third, once your cat is used to the longer lead and collar, replace the lead with the Backyard cat.
Now your cat is trained and your cat will love going outdoors on nice days. You'll love having your cat safe in your own backyard.
The Backyard Cat is waterproof and twist and turn so that it doesn't get stuck in bushes.
Backyard Cat makes your cat a safe and happy outdoor cat that will enjoy nice weather days just like we all do!

Please don't let your cats become a stray.
Instead, let them go out each day to play!
The BackyardCat Team