1. [Strong Suction Cups]This window bird feeder is equipped with 4 heavy duty strong suction cups, ensuring that the feeder securely adheres to any ordinary glass window without easily falling off. So, bird loves can closeer viewing of hummingbird from indoors. 2. [Comfortable & Safe] Our bird feeder for outdoors is designed with the bird's and comfort in mind. It has ample space for different kinds of birds. Additionally, it don't have any sharp edges or points. 3. [Adequate Capacity and Easy to Fill]Clear acrylic window bird feeders usually have a large capacity with 3 feeding compartment, capable of holding various types of birdseed, facilitating easy feeding for birds. Moreover, refilling the feeder does not require dismantling the entire unit; simply slide out the tray, fill it up, and slide it back in place, making the operation straightforward. 4. [All-Weather Durability] Clear acrylic material itself possesses high durability resistance, withstanding rain, snow, and sun , thereby ensuring the hummingbird feeder's long-term usage.