General description This large cat flap is designed for both indoor and outdoor use, making it suitable for adult cats and small dogs. It features a 4-way locking mechanism for added convenience and security. Technical specifications External size: 23.5cm (W) x 25.2cm (H) Internal size: 18cm (W) x 19cm (H) Opening size: 19.6cm (W) x 21.1cm (H) Compatible with walls up to 6cm thick Maximum pet weight: 17 pounds (about 7.7 kg) Maximum waist circumference: 23 inches (about 58.4 cm) 4-Way Locking Four switching modes: open, only outside, only inside, and completely locked Easy adjustment using red and green switches Installation Complete installation instructions included Can be installed on windows, doors, cabinets, etc. Usage Allows pets to enter and exit freely based on the selected locking mode Other information Made of ABS plastic, weather-resistant, smooth, and durable surface Features a waterproof flip cover with closure Brush bar reduces energy loss and ensures quiet operation