The Hummingbird Heinie Warmer is a multi - purpose device that prevents your hummingbird feeder from freezing during the winter, attracts and provides your hummingbirds with a place to warm themselves from the winter chill. Simply hang your hummingbirds’ favorite feeder in the Hummingbird Heinie Warmer and plug it in. The color and warmth from the lights will attract hummingbirds from your surrounding areas. All you need to do is replace the light bulbs if they burn out and keep your feeder filled. Then sit back and watch the unbelievable results