Uh-huh.
um how far you can transmit the signal or the complexity of the functions that you want.
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.