I understand very little but I will t ell you what I know. There are three basic types: 1) In the ear; 2) Over the ear and 3) Covers the ear. The first type has small buds that fit into the outer ear and cling to the walls of the ear and have the troubble that they often are dificult to fit to the ear, mine kept falling out all of the time. The second type has buds that go into the ear, but actually hang from the top of your ear and do not depend on the ear at all. The thirds type actually covers the entire ear and has the troubble that you can not hear anything besides the player when you are wearing it, such as crossing a road while wearing hte headset. I actually preferr the second type, but this really depends on what you fell confortable with.
Looking for a headset 
Linear Mode
