We've been talking for almost two hours now and with a warning bleep, my audio recorder runs out.

The pen includes a built-in audio recorder.

Applications can be as small as the audio recorder, as large as a whole world, or somewhere in between.

This allows a usable recording to be made even for speech some distance from the microphone of an audio recorder.

The first letter signifies the type of audio recorder used to record a musical performance, either analog or digital.