Including: 1pc x heater ( Light Bulb not included ) HUMMINGBIRD FEEDER HEATER WINTER ESSENTIAL: In the cold world,ordinary bird feeders will not be able to feed your birds.Our Hummingbird Feeder Heater will help you solve such problems. Hummingbird Feeder Heaters will provide efficient and solution for freezing hummingbird feeders.Just connect it to the hummingbird feeder and turn it on before the temperature drops below freezing. WIDELY USED: Easy to attach to a variety of flat or round bottom hummingbird feeders with annular perches, Some specially shaped bottom bird feeders will not work. You can refer to pictures. ( Light Bulb Not Included ) HUMMINGBIRD FEEDER PARTS: The Hummingbird Feeder Heater is a separate item that attaches to the bottom of an existing Hummingbird Feeder. It does not include the actual hummingbird feeder. SAVE ELECTRICITY: Hummingbird feeder warmer. With help of the hummingbird feeder heater, you don't need to worry about bird feeders failing in the cold winter, birds can happily feed. QULITY SERVICE: Easy to attach to a variety of flat or round bottom hummingbird feeders with annular perches. Secure in place with adjustable hooks. --- We always expect your inquiry and support. Please let us know if there's any question, and we will help you to solve it.