MAYBE CRUD IN YOUR EARS (SERIOUSLY) ... I NEVER KNEW HOW MUCH THE EAR CANAL HELD UNTIL I SAW AN EAR GET CANDLED... IT WAS... NAAASSSSTTTYYYYY.... BUT YEA IT TAKES A WHILE TO GET USED TO THE WAY THE RADIO'S SOUND AND THE WAY THE UNITS TALK AS WELL... I JUST LOVE IT WHEN YOU GET ONE WHO IS QUIET AND THE ONE AFTER YELLS INTO THE RADIO ... ITS FUNNY (WHEN ITS ON SOMEONE ELSES CHANNEL)