Combined port speed: Some outlets can power both USB ports simultaneously at their maximum speeds.We expect them to become more common soon, however. Only a few wall outlets available today support USB-C Power Delivery, which can provide up to 100 W of power for laptops and other large devices (though most are rated for less). Such models might save you a few dollars up front, but for years they would be charging your phones and tablets at a fraction of the speed of our picks. So we automatically dismissed any models that charged at less than 12 W without testing. Power level and charging speed: The USB ports on the best outlets can charge devices at the maximum speed allowed by the USB standards, which means up to 12 W (2.4 A) for USB-A and higher for USB-C depending on the voltage.The outlets also need to be laid out so that you can plug in four things at the same time. To provide four or more USB ports, some manufacturers remove one or both AC outlets, but doing so erases one of the advantages of built-in USB wall charging: freeing up an AC outlet that’s clogged with a USB wall charger. Number and type of outlets and ports: We looked for models with two AC outlets and two USB ports-ideally two USB-C ports-which is the layout that most effectively maximizes space.
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