Durable Strong Suction Cups:The thickened large suction cups with diameter of 6.5cm increase the suction area to increase the adsorption force. After pressing out the air, the strong suction is stronger than ordinary suction cups. No complicated operation that is easier to install than the screw suction cups, and will not occupy the internal space of the bird feeder, giving the bird a spacious "Large Living Room". When needed, just push upwards to take down the entire bird feeder Detachable Feeder Tray: The detachable food trough allows you to easily and conveniently refill fresh bird seeds without moving the entire bird feeder. Provide birds with a clean and healthy eating environment; Happy birds will sing beautiful songs Porous Drainage System: Features 32 integrally formed holes. This finches feeder can effectively and quickly drain the water accumulated on the tray due to rain or snow, thereby keeping the food in the tray dry and preventing mold; The 2mm hole is sufficient to drain the accumulated water and prevent the seeds from passing through Brilliant bird feeder since it provides one short shot for birds to sit on. Clear Large Viewing Window: The acrylic material with nice transmittance is rainproof, cold-proof and high-temperature resistant; The crystal-like transparency allows this large suction cup window bird feeder to provide clear birds details; and the large circular opening design of 13cm allows you observe the birds' every move up close, enjoy their eating parties and feel the beauty of nature