Smart-Built-in smart chip recognizes the individual device's charging requirement to optimize the charge Powerful-four high-powered charging ports deliver a combined total of 4.2 A of charging power No more searching for charging adapters. Upgrade your existing outlets so you can charge up to two USB powered electronics at once, leaving the outlets-free for additional power needs Compact design fits in a standard wallbox and works with Decora and Decora plus screwless wallplates Microprocessor and smart chip designed for recognizing and optimizing the charging requirements of the electronic device