Some of our chargers need a power supply and some are optional. A quick way to determine if one of the chargers we offer here at MaxAmps requires a power supply is that it will
have 'DC' only in the product title. Chargers that do not require a power supply will have 'AC/DC' in the product title. Some of our AC/DC chargers also have the option to power
them with a power supply for higher wattage. These will be designated with an “Add Power Supply” drop-down menu option.