Google Android 2.3 User Manual page 36

Android basics
3 When prompted to "Speak now," speak what you want to enter.
Say "comma," "period," "question mark," "exclamation mark," or "exclamation
point" to enter punctuation.
When you pause, what you spoke is transcribed by the speech-recognition service
and entered in the text field, underlined. You can press the Delete key
the underlined text. If you start typing or entering more text by speaking, the
underline disappears.
You can edit the text that you enter by typing or speaking. See "Editing text" on
page 37.
AUG-2.3-103
Text that you enter by speaking is
underlined. You can delete it, or you can
continue entering text to keep it.
Touch to enter text by speaking.
36
to erase
Android User's Guide