This product is used to control the safety distance when the door or window is opened, preventing the baby from opening the window at will First wipe the position to be cleaned and remove the adhesive tape located behind the sliding door lock. You can blow the glass with a hair dryer first, then blow the rubber surface, and press the product to the position where it needs to be installed. After pasting, please use after 24 hours to get the best performance from 3M glue The product comes with 3M glue, which is easy to install. function, easy to open for adults, baby is difficult to open.Made of environmentally friendly ABS material, not easy to break Size: 9cm*7cm*4cm.Simply pulling the wings on both sides of the door lock and flatten it. Easy to tell by looking if it's really locked This product is designed to prevent safety hazards and reduce injuries. It's not a substitute for goalies. It is recommended to use two to four for each door. Due to factors such as manual measurement and display differences, there may be slight differences between the individual products and the images , please excuse me.