It doesn't have an usb port. It does use external to the board buttons, it's like a panel there, anyways it is not a problem, i have tried without one to make sure it is not the external plate issue
I've bought a klout mod from a friend recently, after like 2 weeks of using it started working wrong. It changes watts by itself, i thought that's the locked buttons issue, but i'm not sure and i count on any help!