GLOBAL ASSISTIVE DEVICES Vibra LITE 12 Instruction Manual page 13

 HOURLY Alerts, when set "ON," will give a brief reminder every
hour on the hour with the alerts that are turned on. (vibration, sound
or both) Note: Hourly alerts will be based on the Time Zone set to
be displayed in the Calendar Mode.
 Button Alerts, when set "ON", will indentify the current alert
setting (vibration, sound or both) each time the "MODE" or
"ST/STP" button is pressed.
Option Mode Screen Abbreviation: VIBRA = Vibration
Option Mode Programming Instructions:
1) Press the "MODE" button until "OPTION" is displayed at the top
of the screen. After approximately two seconds "VIBRA" will be
displayed. The word "ON" or "OFF" will be displayed at the bottom
of the screen.
2) Hold down the "SET/RST" button until "ON" or "OFF" begins to
flash.
3) Use the "ST/STP" button to turn vibration "ON" or "OFF".