Sun Telecom ST800 User Manual page 20

18. SET VIBRATION/ AUDIBLE ALERT
You can select Vibration or Audible alert mode. At
the stand-by screen, press the FUNTION button to enter
into the funtion menu mode.
Press the Read button to select the audible
or vibration mode.
S E T V I B R A T I O N / A U D I B L E A L E R T