Product features and benefits Sizes (choose to match your doorway and pet): S — Outer: 19 * 19.7 * 2 cm; Inner: 16 * 15.7 cm M — Outer: 19 * 19.7 * 5.3 cm; Inner: 16 * 15.7 cm L — Outer: 25 * 23.5 * 5.3 cm; Inner: 19 * 18 cm XL — Outer: 25 * 5.5 * 27.7 cm; Inner: 22 * 20 cm Why customers need this pet door Gives pets reliable, independent access while keeping your home secure and comfortable. The transparent flap lets pets see through before passing, reducing hesitation and stress. Built-in weather and energy protection keeps drafts and moisture out. The brush strip minimizes heat loss and dampens flap movement for near-silent operation so pets and owners are not disturbed. A 4-way lock provides flexible control over pet access: use the red and green labeled switches to set the door to open, in-only, out-only, or fully locked for easy, manual adjustment. Key functions and standout details Transparent flip flap: clear panel that most pets accept quickly; lets animals see on the other side to encourage smooth transitions. Exterior waterproof screen: helps protect against rain and exterior moisture. Sealed flip cover: windshield- and wiper-proof closure for tighter sealing and improved durability. Brush strip: reduces energy loss, softens impact noise, and improves insulation. Four-way lock with labeled red/green switches: fast, intuitive switching between access modes (open, in-only, out-only, locked). Compatibility and performance Available in four sizes to fit a range of pets and installation openings; measure your door opening against the inner and outer dimensions before ordering. Designed for quiet, low-resistance operation so cats and small pets can push through comfortably without disturbing household peace. Weather-resistant exterior elements and brush sealing help maintain indoor temperature and reduce drafts. Practical applications (use scenarios) Back door access to a fenced yard: let your pet go outside for exercise and come back in without you opening the door. Laundry room or mudroom doorway: give pets a dedicated entrance while keeping the rest of the house closed off. Pet room or indoor containment area: control access with the 4-way lock when you want to confine or release pets for feeding, cleaning, or supervised time. What to check before buying Measure the opening carefully and compare to the inner and outer sizes listed above. Choose a size appropriate for your pet’s shoulder width and height to ensure comfortable passage. Confirm the installation surface and opening depth can accommodate the chosen model dimensions. This pet door combines straightforward installation sizing, a clear transparent flap, weather-resistant exterior screening, a brush strip for insulation and quiet, and a labeled 4-way lock for precise access control.