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Voice activation means that you can leave a recorder in 'standby' and it will automatically start recording once the sound reaches a certain level and stop when it drops below that level.
Therefore you could use it for covert recording and leave it in an empty room - it would only record when someone came in and started talking.
Or you could leave it running on your desk while you were reading documents and it would only go into 'record' mode when you dictated notes out loud.
Here's a round-up of voice activated recorders....
