Given how quickly technology can miniaturize and advance in a century let alone 900 or so years, I have no trouble accepting that the 32nd Cent. combadges can combine so many functions (PADD, tricorder, communicator) along with a power source and be accessible through a personal holo-projector. The one thing I cannot wrap my head around is the personal transporter. Setting aside that the whole concept of the transporter is a bit "magical" technology wise, I can accept that it too can be miniaturized into the badge. What I can't understand is how the bloody thing works??!! Every time we see one used, it's just pressed/activated and it takes the user to where they want to go, but how does it know where the user wants to go? I've seen no voice commands, or other input pre-activation. No indication at all that the destination was somehow input into the badge. So, how does it know where to take the user to?? Can anyone clue me in?? Am I missing something?