Do you have children or live in an area with children? If you do, then you'll be well aware of the fact that children are very curious. While this isn't necessarily a bad thing, it can be pretty dangerous. This is because kids are accident-prone, and you don't want them getting into places where they could hurt themselves. Normally, closing the door would be enough to keep them out, but over time, kids learn to open doors. So simply shutting the door will not work.
This is why you need this door handle child-proofing device. With this device, you'll be able to keep your doors child-proof so your kids will be unable to get into rooms you don't want them in. It's also great for pets who have learned how to open doors!