Efficient 15-watt incandescent bulb provides effective thawing of frozing bird feeders, ensuring hummingbirds are not affected by freezing temperatures. Made of heat-resistant material with a trapezoidal design and black sealing ring to prevent snow and water inflow, offering better protection for the heater. Easy to install and remove with three hooks and an adjustable elastic cord, along with a rubber grip ring to keep it in place and seal out warm air. Gradually heats up the air inside the feeder to prevent freezing, providing an effective and easy way to defrost in cold weather. Suitable for flat or round bottom bird feeders, equipped with a hook and retractable drawstring for stable attachment. Item Name: Bird Feeder Heater Material: Plastic Socket Type: US Plug Features: Freeze Protection, Universal, Easy to Install Size Details: L: 13cm/5.12", W: 13cm/5.12", H: 9cm/3.54" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Lampshade 1 x Cable 1 x Bulb 3 x Hooks