These are like th 'in things' now if you have a cell phone. I actually just now ended up purchasing one recently! Plus my current cell phone was the onlyl one who was Bluetooth compatable.
I went to the Verizon store and I wanted to the cheapest, but most effective Bluetooth they had. I have always had good luck with Motorola so figured the Bluetooth would work great.
It fits in your ear (earbud) and then place the ear curve around your ear. The bud can be uncomfortable if you do not fit it in your ear correctly. You answer your phone with a push of the button on the Bluetooth. There are also seperate buttons for answering calls, power and volume. To charge the Bluetooth you just plug into the adapter like you would your cell phone.
Since I am a state employee I was able to get a discount on accessories, so be sure to check that out.