“This is a very handy little cable with a built-in On/Off Switch, I'm using mine with a Raspberry Pi 3B+ and the Official Raspberry Pi UK Power Supply (the 5.1V 2.5A Micro-USB version). Quality is excellent and it's very handy as I just leave it plugged into the Pi all the time, when I need to use it I just press the switch. Saves wear-and-tear on the Pi's power socket.”