Perky-Pet Window Mounted 14-Ounce Glass Hummingbird Feeder - 455-3 Attaches directly to your window for hours of hummingbird enjoyment Strong tempered glass container,2 flower feeding ports with perches,Holds 14 oz of nectar For optimal success, soak suction cups in hot (not boiling) water for 5 minutes. For best holding power, clean window with ammonia-based window cleaner Dry window completely before mounting