However, use of these plugs without a transformer or voltage converter can result in fireworks. The voltage in Europe is twice that of the voltage in the United States, and while many electronics are designed to adapt to voltage changes, it is crucial to check. If the device is not capable of handling 220 volts of electricity, it will fail.
By the time the ducklings are 3-5 weeks old, weather-dependent, they can spend warm, sunny days outside, carefully supervised and protected from predators. Until the ducks are fully feathered around 7-9 weeks old, they have trouble regulating their body temperature and need heat.
If you want to mix them in with the older hens, have the chicks in a little chicken tractor(or separate pen)just outside the older flocks run, when they are old enough to be outside. You can put your chicks outside when they are about 3 or 4 weeks old, but they still might need a heat lamp.