U.S./Canadian TransformersThese transformers have straight blade pins and are designed primarily for the U.S., Canada, and Mexico, as well as certain other countries, such as Japan.Cir-Kit plug-in transformers provide a safe and convenient power source for any dollhouse or miniature room. All Cir-Kit Concepts' transformers are designed to plug directly into a powered outlet, thus eliminating the need of building a special transformer enclosure within the dollhouse.Cir-Kit DC output transformers are a marked improvement over our prior AC models. They provide a steady 12 volt output, whereas the AC style had a higher output voltage with light loads and a lower voltage at heavy loads. The higher voltage was hard on bulbs and the lower voltage resulted in dimmer lights. The DC transformers are completely solid state allowing a constant 12 volts at all load levels. They also have many safety features including short circuit and current overload protection. They are virtually burn-out proof. The all electronic design also results in a much improved efficiency over that of AC versions.