Malta has extensive wi-fi coverage – most towns and even some of the sleepiest villages have a wi-fi hot spot in their main square. Many establishments, including hotels, cafes, bars and restaurants, also offer wi-fi. The wi-fi at most guesthouses, hostels and hotels is usually free. Signals are of varying quality.
If you're visiting from outside Europe, you may need a voltage converter to adjust the current in Europe (240V) to one your electronic device can handle. You do not usually need these for laptop computers and digital-camera battery chargers.