Thank you for viewing! ^^ This product is brand new and unused. 【No tools required. Easy installation, just stick it on】Easy installation, just stick it on the position slightly below the door knob. ※ Please attach it with the stopper part at the top, and the stopper touching the door knob. 【Strong adhesive that children can't peel off】Uses "3M" double-sided tape with high adhesive strength. It can't be peeled off by children. ★ When removing, it can be easily peeled off by heating with a hair dryer. 【Difficult for small children, but easy for adults to unlock with one hand】 (Unlock) Slide the stopper down while pressing the buttons on both sides. (Lock) Slide up while pressing the buttons on both sides while pressing the button in the center of the main unit. ★ You can't slide it up without pressing the buttons, so there's no worry about being locked from the inside. 【Compatible with various door knobs】Compatible with all types of door knobs, protecting your child from various dangers around doors. 【How to install / Size】1. Decide where to stick it, and remove dust and dirt from the sticking area. 2. Peel off the release paper of the adhesive tape and stick it on. ※ Please attach it with the stopper part at the top (the white round button is below the stopper), and the stopper touching the door knob. 3. Press firmly and wait for about 1 minute until the adhesive strength stabilizes. (Size) Width 4.5cm x Length 12.3cm x Height 1.5cm～7cm Instant purchase is OK!! This product is not subject to price reduction. #704161(455)