Microphones and such

Help me DW/LJ, you're my only ... Well, one of my only hopes.

I am trying to find a good headset microphone to use with my computer (shit going on with hands means voice dictation, but that sort of software doesn't do as well with desktop mics). Necessary criteria:

* wireless (probably Bluetooth I'm guessing).

* good sound quality, because voice dictation.

* long-lasting. Ideal would be 12 hours between charges, but bare minimum is 4ish. I can't put on or take off headsets by myself, and there are gaps where I don't have anyone here to assist me.

* preferably comfortable to wear

Any suggestions? Do any of you use headset mics (wired or not) for voice dictation, and if so what do you use?