Jensen JBD-400 User manual

Paired device is out of range
or turned off Flashing slow

Press the FM ST/MONO button to turn off stereo mode, the display will show
“St OF” message, wait for few seconds to confirm. Programs are now received
in mono mode. In particular when stereo signals are weak. It is preferable to
receive the program in mono when you are receiving a weak station.
Press the FM ST/MONO button again to turn on stereo mode, the display
will show “St ON”, and wait for few seconds to confirm for receiving stereo
programs. The ((ST)) indicator will appear on LCD to show an FM stereo
broadcast is being received.