Easy-to-install door knob child lock to protect children's safety. - Product Name: Door Knob Child Lock - Materials: ABS, POM - Features: Prevents finger pinching, strong 3MVHB adhesive, easy installation - Locking Function: Dual lock, triple lock - How to Use: Press the button and slide Thank you for viewing. I am selling this because I bought it to protect my grandchildren, but I didn't end up needing to use it. Instant purchase OK