Durable construction - Built from robust ABS plastic with an acrylic viewing panel and a sealing strip. Easy to install and helps prevent drafts and insect entry while keeping interior temperature stable. Size and opening - Large cat door: outer dimensions 24.5 cm (width) by 28.5 cm (height); inner opening 20 cm (width) by 22 cm (height). 4-way lock with clear controls - Four modes controlled by red and green switches with labels: In only, Out only, In and Out (open), and Closed (lock). Lets you monitor and manage your pet’s access precisely. Freedom and comfort - The sizable opening allows cats or small dogs to pass through easily and quietly. Pets won’t feel trapped, while you control entry and protect your space from unwanted animals. Practical use scenarios - Home with a cat and a small dog: set to In only during certain hours to supervise outdoor access, then switch to Open or Out only as needed. - House with yard time: keep doors Open during the day for easy in-and-out, and lock at night to restrict access. - Prevent intrusions: use Closed mode to keep pets inside and deter neighborhood animals from entering. Key attributes - Function: door panel with 4-mode locking for flexible pet access - Compatibility: suitable for large cats and small dogs requiring a large opening - Size: outer 24.5 x 28.5 cm; inner opening 20 x 22 cm - Material: ABS plastic body with acrylic plate and sealing strip - Performance: durable, easy to install, and designed to minimize drafts and insect intrusion