Safe and Effective: The child safety window limiter is keyless, with a double button release, just press the sides of the latch to close the window. When properly installed, it can hold up to 30kg in weight and don't worry about your baby pulling the lock body off. The limit distance is 7cm, much smaller than baby's head and larger than baby's arm, which can effectively prevent children from being trapped. It also works for cat/dog house window security. Easy to install: Aosite Window Limiter uses highly elastic, stable, sun and heat resistant 3M VHB adhesive. It can replace screws. You can install the window security locks easily and firmly with adhesive without drilling or screwing, without damaging your window frames, suitable for most window materials. (Tips: Make sure the bonding surface is clean and dry before installation, and wait 72 hours after installation) Durable Material: High quality ABS material, and can withstand high temperature exposure under the sun. Double button and windproof positioning to be locked firmly and will not be easily moved, no fear of strong wind. Childproof window openers are widely used for most PVC, metal and wood frames. No more worrying about your toddlers/pets window safety or strong winds blowing the window shut. Wide Application: Our window locks for kids are perfect for keeping your pets or toddlers inside the room. This UPVC window restrictor is suitable for most window types like inward opening windows (need to have adjacent windows), bottom outward opening windows. It can also protect the windows from people who might try to enter without permission to ensure the safety of your family or property. Widely used in homes, commercial places, shopping malls and offices.