Apple iPhone OS 3.1 - Manual (Page 125)

Voice Memos
15
Recording Voice Memos
Voice Memos lets you use iPhone as a portable recording device using the built-in
microphone, iPhone or Bluetooth headset mic, or supported external microphone.
Note: External microphones must be designed to work with the iPhone headset
jack or Dock Connector, such as Apple-branded earbuds or authorized third-party
accessories marked with the Apple “Works with iPhone” logo.
You can adjust the recording level by moving the microphone closer to or further
away from what you’re recording. For better recording quality, the loudest level on the
level meter should be between –3dB and 0 dB.
Record button
Audio level meter
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