Glass Hummingbird Feeder, Garden Hanging Plastic Bird Feeder for UPGRADED DESIGN:The heated window hummingbird feeder with wide-mouth bottle design and leak-proof design is easy to fill and clean; once the container is filled and the bottom is tightened, simply flip it over. Humming Heater Mangeoire Colibri Humming With Ant Moat - 5 Feeding Ports, 3 Suction Hooks For Window Mounting Ant Moat Feeder Bird Feeder HEAT TO A SAFE TEMPERATURE TO PREVENT FREEZING IN WINTER:The device has added a self-protection device. A heated hummingbird feeder helps keep nectar from freezing when it’s cold outside. This is great if you want hummingbirds to visit your yard all year long, even in winter. The heater attaches easily to the bottom of your outdoor feeder. You don’t need to buy a new feeder, just add this heater Aazon.co : Heated Huingbird feeders for Winter Outdoors,Hanging with a Suction Cup and a... No need to worry about freezing,making hummingbirdsunable to eat in the cold winter. Whenthe temperature exceeds 19 degrees Celsius(66., 2 degrees Fahrenheit),the device will activate the auto-matic protecton function and no longer heat up.