Yes, we recommend that you bring a multi-adapter for Cuba to plug in your electrical devices, which should cost only $9.99 to $20.00, if you don't already have one. A multi-adapter will allow you to plug in your electrical devices to almost any plug configuration around the world. While the electrical current in Cuba can be both 110v AC (the same as in the U.S.) or 220v AC, most gadgets used today including smart phone chargers, lap tops, hair dryers, and more are dual-voltage, which means you will not need a bulky and expensive 'voltage converter', which is different from your electrical adapter.
If you are bringing an electric device, namely a very old one, and aren't sure if it will accept dual-voltage, you can look for your device online, check on the device itself, and see if it accepts dual-voltage. If it doesn't, many travel and consumer electronic experts recommend replacing the item, and buying a newer one, which will accept dual-voltage. If replacing the item isn't possible and you aren't certain if the device accepts dual-voltage, those same experts recommend leaving the device at home, or bringing a voltage converter.