[Patented Technology]: Infant safety products with patented technology. This has a sturdy hinge mechanism that flows smoothly while resisting damage or breaks. It can effectively lock the door handle so that the baby or pet can't open the door you don't want to be opened. Place around their home for highly effective baby and toddler proofing. [High Quality ABS Material]: Certain proportion of PC material is added on the basis of ABS material to obtain high strength hardness and firmness. The pasting part adopts 3M back glue, which is firm and lasting. Its service life is almost lifetime until you want to remove it. [Easy to Install and Remove]: No need to drill hole, no need tools. Just stick 3M adhesive to the cleaned door and it will stick until you want to remove it. If you want to remove the door lever lock, heat the 3M sticker with a hairdryer and remove it easily. No damage or marks will be left on the door. [Easy One-hand Operation]: When you hold the child in one arm, you can't operate with both hands. Don't worry! You can open this lock with just 2 fingers. Simply press the release button on both sides and swing the lever up. Both Men and Women can effortlessly open and close the lock with just one hand. [Lifetime Warranty]: If you are not satisfied with our products, please contact us directly so that we can help you. We have 100% customer satisfaction commitment and lifelong guarantee for product quality.