Will any headset work with android? I'm looking for a good headset, preferably with mic, answer button and volume controls.  I see iPhone compatible everywhere but no mention of Android compatible.  Do they use the same specifications, and do I need to worry about compatibility when buying a wired headset?
Headsets with mic, answer button and volume controls which are iPhone compatible, in general, will not work with Android headsets. The mic and the sound will work, but the buttons will not.

Headset with mic and only one button will work without problems.