In Wales, the standard voltage is 230 V and the frequency is 50 Hz. The sockets, type G, are unique to the UK and have three rectangular pins. If your device does not fit into the type G socket, you will need a travel adapter. Please note that travel adapters only adapt the shape of the outlet, but do not convert the voltage or frequency. If your device is not designed for 230V, you may need to purchase a voltage converter.