2.Push the “Menu Switch” down (Next) 
or up (Previous) 
to select the DISABLE, or
ENABLE option and press the “Menu Switch” inwards (MENU) 
to confirm the selection and return to the SETTINGS Menu.
Sleep
Sets a time delay to automatically Power OFF the T.sonic™ 840 even during operation.
1.In the SETTINGS Menu, push the “Menu Switch” down (Next) 
or up (Previous) 
to
select the Sleep item, then press the “Menu Switch” inwards (MENU) 
to enter the Sleep Mode.
2.Push the “Menu Switch” down (Next) 
or up (Previous) 
to set the Sleep timer for the
unit to automatically Power OFF: Disable – 15 Min – 30 Min – 60 Min. Press the “Menu Switch”
inwards (MENU) 
to select the Sleep timer delay and return to the SETTINGS Menu.