Why you need it: Are you worried that your baby might accidentally lock himself in the room while playing? Are you worried about the dangers of opening the door for your child or pet while they are at home, but can't always watch over them? With our child proof door lock cover, you can install the rotating back-lock safety deadbolt, and don't have to worry about your child accidentally operating the deadbolt. The baby is safer and you feel more secure. Hidden switch,difficult for children to open:child proof door knob covers for door needs fingers to squeeze the button of the cover inward,and then toggle it upward to open,which is easy for adults to open,even you can open the deadbolt cover with one hand while holding a child or a briefcase,but it hard for children to understand,which effectively prevents the child from locking the door in the house alone,and then crying out in fear while you can't open the door in time. Simple installation: No drill or tools are required during installation.The deadbolt cover has a non-marking adhesive backing that can withstand a 15-20 pound pull to ensure that your baby can't pull the deadbolt cover open.Remove the protective film on the adhesive backing and press it onto the safety lock latch.If you are renting an apartment,you don't have to worry about damaging the door,and if you want to remove it,there will be no residue left on the lock surface to keep it clean and new. Environmentally friendly and beautiful:child proof door lock cover uses environmentally friendly and harmless ABS material,with a solid shell and smooth surface without edges and corners,which will not cause harm to your child.At the same time,the stylish black and transparent design,when installed in the bathroom,bedroom,children's room,toy room,living room door,etc.can meet personalized needs and easily integrate into various home environments,making it both beautiful and practical. Strong applicability:Four protective covers for deadbolt,which can be placed on multiple door deadbolt in your home.The door knob safety cover for kids measures 3.14 x 1.57 x 1.57 inches and has an inner diameter of 1.57 inches,which fits most standard door deadbolts on the market.Please measure the size of your door deadbolt's before purchasing to prevent it from not being used.