Upgraded 4 rounds of passwords are more . The 3 rounds of passwords are improved to 4 rounds of passwords, which are stronger and more .This better protects older and more naughty children. 't worry - you can apply these locks any where you need to, and move if necessary. Installing : Use High quality Adhesives that have been tested for will not leave residue if taken off (Takes a lot of force to ) Refrigerator lock will instantly stick to fridge, not require drilling or screws.The lock is small and . So it does not look so big on your refrigerator. No more fear accidentally harming your child with the device built to . It can adapt to any surface.So child safety locks can even be fitted onto your drawer,,refrigerator,window,cupboard, oven,freezer. Instructions: clean and dry the surface of Refrigerator. -assmble the upper lock arm to the base. Find out the suitable palce and the location. Colour:Black Material:+stainless steel package contents 1 x password lock Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.