Made of materials.AC117V - AC230V switch.Maximum load power is 70W.Perfect for traveling anywhere, very convenient.Dual channel voltage converter from 110/120V to 220/240V, also from 220/240V to 110/120V.Instructions:Before using this adapter, please make sure the voltage you need, you need to check the switch position on the bottom of the adapter.That is:A. To switch to AC117V, the input voltage must be AC110/120V, and the voltage converter (output) AC220/240V, suitable for household appliances used in the or any other country.B. Switch to AC230V, the input voltage must be AC220/240V, and change the voltage to (output) AC110/120V, foreign electrical appliances are used in China.Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on.Colour:WhiteMaterial:PlasticPackage Contents:1 * 110V to 220V Step-Up/Down Converter1 * Converter plug (us to eu) other products are not included.