Enjoy worldwide compatibility: With 4 AC outputs, including 2 US standard sockets and 2 universal sockets(except for the Big South African plug), this transformer can auto-convert 110-120V to 220-240V or 220-240V to 110-120V. The transformer can be used in countries which voltage are 90V 125V or 180V 250V such as US, EU, UK, JP and more. Efficient and energy-saving: Its built-in high-performance toroidal transformer with stable output and low consumption makes it efficient and energy-saving. Plus, with no noise function, you can enjoy a peaceful and quiet experience. Protect your appliances: The Voltage Transformer Converter can be used with any kind of appliance or device, such as rice cookers, hot water pots, household food mixers. Ideal for computers and electronics.