Mm-hmm.
Like for example , voice recognition , right. That might be constrained because that  you might need to power a microphone , you might need to power other things , so that's one perhaps constraint there. Um  Th Okay , the basic thing is there's a user interface where people punch a button or talk into it or smile to it or blink their eyes , whatever.
Hmm.
You know , and that um picks up an input from a user , um uh a logic  a series of logic has to decide what the user is telling the device , and the device has to r you know , based on you push button A_ , so I will do something with button A_. So maybe button A_ is the power button , okay.