Sony Ericsson have their very own motion activated headphones which actually sense the user. The headphones are MH907 model ones and the expert things about these headphones is that when the user inserts the earphones which enables the user to start listening and when removing the the earphones from the ears it pauses the music and removing the earphones from the plug simply stops the music.
This is exactly the same when wanting to answer calls and end calls as simple as 1 2 and 3.

The design of the headphones is very elegant looking and stylish and can easily be inserted in their ears without any problems or hassles.

I think that I have seen is that headphones with phones are not so good, but the Sony Ericsson ones are not only good in the way they work but looks wise too.