Why you need it: Are you worried that your 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 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 can't pull the deadbolt cover open. Environmentally friendly and beautiful: child proof door lock cover uses environmentally friendly and harmless material Strong applicability: Four protective covers for deadbolt, which can be placed on multiple door deadbolt in your home, 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. Material: plastic colour: Black Package Contents: 4 x Safety Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.