Shatterproof plastic reservoir. 1 feeding port with wide mouth for easy filling. View birds easily from inside window. Holds up to 1 cup of mixed seed. Dimensions: 6.88W x 5.6D x 7.78H inches. The Birdscapes Clear Window Feeder is an economical and convenient window bird feeder that easily attaches to any window surface. The Birdscapes Clear Window Feeder holds up to 1 cup of seed and has a wide open compartment that gives birds unfettered access to seeds resting in the bottom. Simply fill the seed basic and watch wild birds flock to feed! Bird watching is easy and fun with the crystal clear window bird feeder. Remember to clean your window bird feeder once every two weeks with a mild soap and water solution.