Sneak-a-Peek Heavy Duty Crystal Clear Polycarbonate House Window Seed Feeder. Simply attach a filled feeder to a clean window and enjoy the show. This double decker feeder feeds twice as many birds and gives you a clear unobstructed full view of the birds. Includes a 1-way mirror, you can see the birds but they cant see you. Filling is easy with an easy access refill port, and seed is protected with stay dry integrated seed storage and retractable feeding trays with drain holes. Easy to install feeder comes with extra strong suction cups which makes it a easy and quick installation. Simply attach the suction cups to any window without a screen.