The clip is good for quickly adding multiple ports to your tabletop to which you can connect traditional 2 or 3 pin cables. walls, this is not the solution for you. USB ports should simply be ignored or better sealed with adhesive tape. They don't supply a stable 5 volts. As my initial tests with the meter showed, they output 4.7V with no load, and when the load reached just 1/2A the voltage dropped to 4.6V. I don't see any USB ports for charging, although they do it can work to power USB devices such as lamps and fans.
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