【Voltage transformer 】We provide you a safe, dependable, stable, cost-effective & easy solution to converting voltages from 110/120 volts up to 220/240 volts or from 220 volts down to 110 volts.(220V to 110V, 110V to 220V) 【Multi-application】The Voltage Converter Transformer can be used with any kind of appliance or device, like CPAP Machine, Electrical toothbrush , Hair Straightener, Laptop, Mobile phones, Curling Irons, Heating Pad, Television, Xbox, etc. 【Note】The transformer only converts the voltage, not the frequency hz. If your appliance is not compatible with 50/60hz, it will have an effect on the usage effect. Hair dryers and coffee makers are recommended to choose a transformer with more than 2 times power. 【Sockets】The transformer can be used in countries which voltage are 110V～120V or 220V～240V such as US, EUR, UK, JP and more.【7x24hrs Continous Run】High efficiency toroidal transformer with stable output and low consumption. 【Safe】Dual circuit breakers protective for each voltage that is safe operation.If you have any questions,please feel free to contact us.