However, even though these pins are here, doesn’t mean that the wires for data transfer (pins 2 and 3) are necessarily available. Pin 1 and 4 carry the power (for example, to charge your phone), pins 2 and 3 are used for data transfer (like sending photos). Why is that? Let’s take a look at the pins of a USB-A connector: Image adapted from Simon Eugster / Wikimedia Commons / CC-BY-SA One of these will work, and the other will not. However, something funny happens when you try to use these cables to send over data to a device, like sending music to your (Android) smartphone or books to your e-reader (like a Kindle or Kobo). They are both black, have a USB-A connector on one side and a Micro USB connector on the other side, and feature the ‘trident’ USB logo. Here’s a seemingly simple question, what is the difference between these two Micro USB to USB-A cables?
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