i have no clue what its called, but some people call it a pimp switch. what it does is like make a whistling noise. its a push button attached to a siren type horn, like off a alarm. say u see a pretty lady, might wanna let her know ur there by giving her a little holla. only thing i cant find the damn things. anyone seen em around. my friend said they were sellin em out at the races in orlando a month or so back. let me know where i can get one at. thanks