First outlet of its kind to add USB connection to a GFCI outlet for easier charging ... ground fault protection with a trip indicator light and reset button on the outlet for easy, accessible ...
Another way to test a GFCI is to use a GFCI receptacle tester. Plug the tester in and hit the button. You should hear a click, and the power light will go off. Remove the tester and reset the GFCI ...