Ankway Durable Acrylic Window Bird Feeder for Outside with 3 Strong Sticky Suction Cups, Removable Tray, Drain Holes for Bluebird Cardinal Bird Bedding & Bath Gripflex spikeless outsole IT8T644950 Gripflex spikeless outsole 🔥A RECALIBRATION FEATURE GUARANTEES ACCURATE RESULTS Ultra Sticky Suction Cups:Secure three strong suction cups sticks tightly on the window or most surfaces which ensures the feeder remains secure to your window even in extreme weather for SEVERAL YEARS and without leaving any nasty mark on your window or other surfaces Clean and Refill Mess Free:The bird feeder has a removable tray so that the main feeder can be left on the window and only the tray can be removed for cleaning and refilling which means there is no need to remove suction cups every time you want to remove old seed to add new seed