Toyota 2006 Prius Owner's Manual page 196

27p230
5. If you select a switch you registered
before, this screen is displayed.
Touch the "Yes" switch if you want
to overwrite it.
196
D
Editing the speed tone.
You can edit the speed tone.
27p231
1. Touch the "Edit" switch of "Speed
Tone".
27p232
2. Touch the switch you want to edit.