Attach this birdhouse to the outside of your window and watch the bird's nesting process up close and personal. The 1.25" opening is ideal for an array of backyard bird species. The three suction cup mount provides stability. Place your birdhouse on the desired location, close the curtains and periodically check in to observe the bird's nest, including egg-laying and chick hatching... All from the comfort of your home. This set includes a mylar film so you can see the birds in their environment without disturbing them because they can't see you! The 7" x 8.5" birdhouse is made of wood and plastic. The kit comes packaged inside a high-quality box.,Window Bird House Watcher.