Kindly follow the below steps:
Press enter key for the main menu.
Select audible alarm option from "SET" menu.
Press enter key "speaker" icon will start flashing, using scroll key select "y" option and press enter key to enable the audible alarm.
Press enter key for the main menu.
Select audible alarm option from "SET" menu.
Press enter key "speaker" icon will start flashing, using scroll key select "y" option and press enter key to enable the audible alarm.