with a cell phone, it lets you talk hands free. not like using ear phones, no cords. nothing to get in the way or tangle.

you walk arond looking like mr spock. jk. i tease my husband about the ear piece. it just hooks on your ear.

i have a nissan. my car has blue tooth. so when i'm driving i can look like i'm talking to myself. not even an ear piece. ( the car has a microphone and the other person comes over the speakers)