Review on Removable Clamp Desk Edge Power Strip with USB Port - Switched Socket, 6.5 ft Extension Cord Connects 4 Plugs for Home, Office, and Reading by Patrick Ceo

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.