KidCo Child Safety Door Knob Locks, 2 Pack

These have worked great! They have kept my clever two year old from being able to open doors. They are hard to initially open, and then install on the doorknob, and when they spin around, they sometimes gets caught in the door. One of ours broke that way. On our one doorknob that has the little turning lock on the back of it, I have to reach in the hole with two fingers to lock/unlock it, and that's a bit tricky. I don't care about these small things, though, because their function outweighs these little inconveniences. I have them on every doorknob in my house, and they work great. I bought another one when we broke the one cover, so I would definitely buy them again, and recommend them.