When i looked this up under chromebook help and i found this note.
Mobile phone charging cable types.
You ll need a usb cable to connect your phone to your chromebook.
Make sure that the cable is inserted the correct way so as not to damage the cable or device.
When charging you will connect the usb a side into the usb plug or into a laptop or computer.
You can connect various devices such as smartphones cameras keyboards and more to.
But you should make sure that you have the right cable to avoid risk of damage to the charging port on your phone.
Usb a cables will only go into the port one way.
Just to confuse things a little there are micro a and micro b usb connectors.
The company claims that charge times are up to eight percent faster than most standard cables and that it has a 480mbps data transfer via backwards compatible usb 2 0.
Usb type a connectors are extremely common and will likely be at one end of a lot of usb cables nowadays.
The vast majority of smartphones do use micro b.
You can usually tell which way up they should be by the usb symbol printed on the top.