Lesson of the Day: certain bullet vibrators with a wireless remote are tuned to the same frequency, meaning that you can control more than one with the same remote.
Hopefully you will discover this by having the lady at the sex shop test the one you are about to buy and noticing that the other one on the countertop also vibrates when she turns on yours.
Hopefully you will not discover, while out to dinner with your date, that someone else in the restaurant has one, too.
I'm pretty sure this is a scene straight out of the movie Shortbus.