Improved Childproof Door Lever Lock (4 Pack) Prevents Toddlers From Opening Doors. Easy One Hand Operation for Adults. Durable ABS with 3M Adhesive Backing. Simple Install, No Tools Needed (White, 4)

Product was easy to install and after months of use, adhesion is still very strong.

I accidently placed one incorrectly and it was ridiculously difficult to get off, so the adhesion is great. While unlocking it isnt difficult, it does feel awkward and takes some time to get used to.

Work as advertised

If your toddler is like mine, they pull down on the handle instead of up. We figured out that putting them on upside down prevented him from getting through the doors and made life much easier when we used the doors!