Modern USB ports built into wall outlets can charge devices nearly or just as fast as a wall outlet itself. ELEGRP’s USB-A ports, for example, each provide 2.4 amps of output to charge phones and tablets at maximum speeds those devices can handle. And combining two USB ports effectively matches a wall outlet’s capacity. However, a standard wall outlet must power devices through adapters that regulate electricity flow. This sometimes minimizes charging capabilities compared to connecting directly to a high-output USB port. The latest iPhone 14 Pro Max, for instance, can charge up to 27% faster through its USB-C cable than the standard iPhone power adapter plugged into an outlet.