# How does USB port on a power strip detect the optimal current output?

I am looking to buy a power strip with USB ports and came across this one online. The description says "Top-notch USB smart charging technology which can detect and deliver optimal current output up to 2.4A per port." So when I charge my iPhone 6s which requires input current of 1A, the USB port will deliver exactly 1A?

• deliver optimal current output up to 2.4A ..... it means that it will hold the output voltage at 5V as long as you do not draw more than 2.4A ..... if you draw more current, then the voltage will start dropping or the output will shut down or the charger will start smoking – jsotola Jan 10 at 3:31
• In other words, it's a USB power strip that does nothing more than adhere to USB specs. Oh, the frabjous joy! – TimWescott Jan 10 at 3:50