They have different features because the PX21 is a multi console/PC headset see related link
Well it really depends whether you wanted it for chat or for game sound if you want it for chat go for a Gio tech or a turtle beach PB, if you looking for a headset for game sound and a build in chat Mic get a turtle beach PX21.
headset with microphone
go to youtube and type FIX BROKEN TURTLE BEACH PX21 HEADSET. If that does not work, then try super glue or really tough tape
search on amazon.com OPTIONAL are there any usb headset mics.
Only if you have symbian OS, then DLL Mobiola Headset.
Unplug the USB.
You can use a headset (NON USB) or a NON USB mic no you can't dummy!
No, But it does come with a headset with a built in mic.
nope, its part of the headset
No, only the headset can be used to communicate with other players.
A boom microphone is a microphone on a boom which is normally on a headset. A swivel boom would be a headset microphone that can swivel.