INNOVATIVE: Patented Auto retractable/fold back system.FLEXIBLE: Fits openings from 21.7" - 45" inches. Fitted inside a door frame: 25.4" - 45.6". Fitted outside a door frame: 21.7" - 41.7".CONVENIENT: Can be angle mounted on the inside and outside of the door frame as well as at the top or bottom of stairs and banisters.EASY INSTALLATION: Completely Adjustable. No Trip Bar. Fully Retractable.SAFE & HIGH QUALITY: Made in Denmark. 100% PVC FREEMULTI-PURPOSE: Ideal for kids & pets. Folds back out of sight when not required.