My cell phone is about 4 years old. It isn't compatible with bluetooth technology. So when I decided to look for an in the ear mic for the cell phone I had alot of choices. I really love this Plantronic brand ear mic. It fits my ear perfectly. I get great compliments on the quality of the sound when I am talking using the microphone.
When I am driving I especially like using it. I can hook it up and if I get a call there is a button on the cord to press and answer the call. No looking down for my cell phone and possibly taking my eyes off the road. If you have to use your cell phone when you are driving, this is a great product for you to own. You can easily switch from one call to another with a press of the button. It can store easily in your pocket when you don't need it.
It's not as cool looking as the bluetooth wireless ear bud but for me it works!