1. 4 strong suction cups This bird feeder for windows is equipped with 4 strong suction cups. Even when more than one bird feeder is present at the same time, the installation on the window remains stable and does not fall off easily. Size of the window bird feeder: 21.5 x 20.5 x 10 cm. 2. Removable bird feeding trays Use the included suction cups to attach the bird feeder to any window. Simply remove the tray for easy cleaning and refilling with bird food. It withstands all types of weather. 3. Bird feeder made of acrylic: Easy to assemble. The window feeder attracts all kinds of birds to your window. You can clearly see how they enjoy their food. 4. Unique gift for children, cats and elderly people The window bird feeder is suitable for any glass window. It is a great choice to let your children learn about nature and birds, entertain your cats and bring peace to your elderly parents or grandparents. It is also a perfect gift for bird lovers.