4 WAY SWITCHING MODE - The pet door can be adjusted using the red and green switches with tabs to 4 modes: exit only, entry only, entry and exit, and fully locked, control easy for your pet to get in and out of. SIZE AND APPLICATION - Outer Size: 28cm x 24.9cm x 5.5cm(H x W x D), Interior size: 22cm x 20cm(H x W), Cutout size: 24cm x 21cm(H x W), suitable for doors and thin walls, suitable for cats and dogs under 12.49kg and waist circumference under 63cm SAFE AND THOUGHTFUL -Clear flap allows animals to see through the door. Outer rain seal is for waterproof. The brush strip eliminates noise from closing the door. EASY INSTALLATION - Full instructions are included, making it easy for you to install in windows, doors, closets, panels and walls, etc. EXCELLENT QUALITY - Made of weather-resistant ABS, the surface is smooth and durable.