SIZE: This is a large cat door with outer dimensions of 9.25"(W) x 9.92"(H) x 2.16"(D), inner dimensions of 7.08"(W) x 7.48"(H), and a cut-out size of 7.7"(W) x 8.3"(H). Suitable for installation on doors, thin metal doors, and walls up to 2.36 inches thick. Thicker walls may result in gaps. Suitable for cats weighing less than 17 lbs and with a waist circumference under 23 inches. 4-WAY LOCKING: The cat flap can be adjusted using the red and green switches with tabs. Settings include: open, in only, out only, or fully locked. Easy adjustment keeps your pets in or out as needed. CAT FLAP: The transparent flap is a pet favorite. A draft and rainproof brush-sealed flap with closure. The brush strip reduces energy loss and ensures silent operation, minimizing disturbance to both pets and owners. EASY TO INSTALL: Complete instructions are included for easy installation in doors and walls up to 50mm thick. PREMIUM QUALITY: Made of durable, weather-resistant ABS plastic with a smooth surface. Our cat flap door comes with a 2-year warranty. Contact us with any questions.