Lock and unlock --- Special design of lock and unlock methods. All three buttons require two hands to lock and can be easily operated and unlocked with one hand (2 fingers). Simple and easy to use for adults, but difficult for children to use. A simple and discreet design that fits perfectly with your room decor. Wide range of applications: suitable for most types of door handles on the market, it has a wide range of applications because it is more convenient and smaller than similar locks on the market. Why you need it - No more children or pets locking you in a room; Prevents children from entering specific rooms such as toilets or storage rooms without adult supervision; Prevents children from playing with doors and pinching their fingers. Tips --- Unlock the safety lock permanently when your children are not nearby. Make sure the arms cannot push up or down in the "locked" and "unlocked" positions. Note: The data is manual measurement, please allow 1-3cm error, due to the differences between light and screen, there will be a certain color difference, the specific received in kind shall prevail.