Mono Mode; Deep Bass Boost Switch; Auto Power Off - Roberts R9988 Operating Instructions Manual

Mono mode (FM only)
1. If a station being received is weak some hiss may be audible. To
reduce the hiss slide the Stereo/Mono/Speaker switch to the
"Mono" position. The stereo indicator will be removed from the
display.

Deep Bass Boost switch

1. Pressing the DBB button will enhance bass sounds. The display
will show
DBB function. The
Note: It is recommended for best results that the DBB function is
used only whe listening via earphones.

Auto power off

1. In order to save battery power, your radio is designed to
automatically switch off after 90 minutes of use . This feature can
be disabled by continuing to hold down (2 sec) the Power button
when the radio is first switched on. The Auto power off symbol
will be removed from the display.
90
The Auto power off function is reactivated next time radio is switched
on.
19
. Press the DBB button again to switch off the
symbol will be removed from the display.