The Infinity Feeder is a patented design that combines the best features of a platform bird feeder with the large capacity of a hopper bird feeder. As the seed is eaten, the outer box drops down, maintaining a consistently level feeding surface. With a 360-degree view, birds will feel safer and stay longer. Fill this feeder less often than a platform feeder, as it features a large 5-pound capacity. For optimal function, it is recommended to feed with sunflower seeds. A seed level indicator will start to show when it is time to refill the feeder. This feeder is great for birdwatching.