personal listening device recording ability

[Fabbs]

For seminars.
That are not/cannot be recorded in line.

Little MP3 deals that record with their built in microphone.
How can one access info which ones have the best recording power? Which mics have the most grabability? Thus the best playback.

Example:
http://www.google.com/products/catal...ed=0CHUQ8gIwBA

[Fabbs]

Doesn't anybody here ever go to a seminar and need to record it?

[ElNono]

Not here, sorry.