Electrical current on board is European of 220 volts. Sockets you will find in cabins have two round pins of 4.8 mm in diameter. If you come from a place with different electrical sockets, in order to use any appliances (e.g. shavers, battery chargers, etc.) you should bring 2 things: a universal transformer to convert the power if your device does not support 220 volts power, and universal adapter plugs for sockets if they differ from the ones in your country.