Window hook! Holds great I used it for a humming bird feeder but it can also be used to hang plant pots or other type of feeders. Hold up to 3lbs, made of a strong polycarbonate, will not crack, yellow or peel, can be mounted with hook in up or down position. I did just like instructions to clean window glass, then soak suction cups for 2 minutes in warm water, then press cups to reverse cups, then stick to window by pushing twice, releasing trapped air.  I hang the bird feeder and still there intact! You can mount up or down direction with this window hook.