Could I accidentally activate someone else's vibrator?
This is extremely unlikely. There would have to be two identical vibrators
in the vicinity.
Long Answer: Unless you're
attending a high-tech swingers convention, it's not likely that anyone
nearby is going to be wearing an identical vibrator, and even if this
scenario occurred, it's unlikely they would figure out what was
happening until after the fact, or let on if they did.
However, if you and a
partner want to play a "hands-off" game where you both wear remote
controlled vibrators and each partner controls the other's, then this
would become an issue. You would need to get two different models of
remote controlled vibrator and make sure that the controls to each are
keyed on different radio frequencies to avoid getting your signals