With the adjustable plate, it is easy to install to the window and the hose. It can prevents the vented warm air from coming back into your room. It is made of PVC. There are two styles for you to choose from: 1 is 1pc window adapter; 2 are 2Pcs window plates. Suitable for all portable air conditioners with an air outlet of 15cm/5.91" in diameter. Item Name: Window Adapter Material:PVC Size Details: 1 : Window Adapter Size: 15cm x 21.5cm x 7.5cm/5.91" x 8.46" x 2.95" (Approx.); Fit for Air Vent Diameter: 15cm/5.91" (Approx.) 2 : Window Plate Size: 67.6cm x 9.5cm/26.57" x 3.74" (Approx.); Maximum Adjustable Length: 130cm/51.18(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Window Adapter or 2 X Window Plate