The Window Hummer-2 holds 6 ounces of nectar and features two ports with two complete sets of nectar guard tips. Nectar guards virtually eliminate insect contamination of the nectar while still allowing hummingbirds to feed. The cap is bright red to attract hummingbirds and has a nectar recipe engraved on it. The red filler cap has a 0.5 inch hole in it that can be aligned with the hole in the clear cleaning cover beneath it for quick and easy refills. Unscrew both caps for easy cleaning. Use the included port brush carefully to clean the ports and nectar guards. The feeder cover and basin are made of U.V. stabilized polycarbonate. The feeder may be mounted to your window with the included suction cups. Made in the U.S.A. Lifetime Guarantee. To see more great products like this, check out the rest of our Bird Feeders.