Transformer - How To Use?

The front of the transformer is the output Voltage, while the back of the transformer is the input Voltage.

The output Voltage should be the same as the Voltage of the appliance you're using on the transformer. (E.g. If your appliance is made in the US, which has a Voltage of 120V, plug it into the 110V socket)

The input Voltage should correspond to the country you're using the transformer in. (E.g. In Singapore, the Voltage is 220-230V, so the input Voltage should be switched to 220-240V.)