Four locking options controlled by a simple switch: open, locked, in-only (cat can enter but cannot exit), and only (cat cannot enter yet). This lets you manage pets in and out of your home with ease. Pet compatibility and size: PET flap size 7.25 in x 8 in x 1.2 in; fits all types of cats and some small dogs under 6 kg / 13 lbs. Glass-friendly design: Clear, unobtrusive appearance that blends with glass surfaces. Ideal for windows, glass doors, and PVC doors, enhancing decor while providing pet access. Quiet and comfortable operation: Two-part door construction with a door brush strip to minimize noise and drafts; smooth, quiet action that won’t startle pets or disturb you. Use scenarios: - Give your cat freedom to come and go during the day by using open or in-only mode, and switch to locked at night. - Manage multiple pets or visitors by using the locking options to control which animals can enter the home. - Install on glass doors or windows to preserve aesthetics while still providing your pet easy access.