Press OFF or DSPL during operation Press DSPL for 2 seconds Hour will flash + or - to change press SEL momentarily Minutes will flash Again + or - Press DSPL momentarily The clock starts Note: if the power select switch on the bottom of th unit is set to the B position, the clock cannot be set unless the power is turned on. Set the clock after you have turned on the radio. Straight from the manual hope this helps I was wondering what the BUS in jack is for but cannot seem to get an answer. Bryan