Material and Package: The UPVC window restrictor is made of high-quality ABS material, which is safe and odorless. The package includes 2 adjustable safety locks. Double Switch Design: The multifunctional window lock adopts a double switch locking design, specially designed to protect children and pets. It can lock windows, sliding doors, balconies, and other dangerous places to prevent babies and pets from falling out of windows while playing. Adjust at will: You can adjust the length of the window restrictor chain according to the desired window opening size to achieve a customized distance and limited ventilation while ensuring the safety of the baby and cat inside. The gap sizes vary from 3.5 cm to 19 cm. Self-adhesive: The child safety window locks are designed with an adhesive backing. Simply peel off the adhesive tape on the back for easy application and installation. Application: Child safety window restrictors are widely used on most UPVC, metal, wooden, casement, and sliding windows. In addition, child and pet safety locks can also be applied to sliding doors, cabinet doors, refrigerator doors, etc.