Voltage: The United States uses 120V, 60Hz.
Plug Type: Type A and Type B (flat parallel pins, Type B adds a grounding pin), standard across North America.
Adapters Needed:
Voltage Converters: Most modern electronics (phones, laptops, cameras) are dual-voltage (100-240V) and only need a plug adapter, not a converter. Hair dryers and straighteners from 230V countries may need a voltage converter.
Where to Buy: Adapters available at the airport, drugstores (CVS, Walgreens), and most hotel gift shops on the Strip, though at a markup - cheaper to bring one from home.