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
Unplug the USB.
search on amazon.com OPTIONAL are there any usb headset mics.
Only if you have symbian OS, then DLL Mobiola Headset.
You can use a headset (NON USB) or a NON USB mic no you can't dummy!
nope, its part of the headset
No, But it does come with a headset with a built in mic.
If your headset microphone is working but the standalone mic isn't, check the following: First, ensure the standalone mic is properly connected to the correct input on your device. Next, verify that the mic is enabled in your system settings and that the volume levels are appropriately adjusted. Additionally, check for any physical damage to the mic or the cables, and consider testing the mic on another device to rule out hardware issues.
No, only the headset can be used to communicate with other players.