LG LCS300AN Owner's Manual page 13

(OPTIONAL)
REG (Region) ON/ OFF
REG ON : The unit switches to another station, within the same network,
broadcasting the same program when the receiving signals from the current
station become weak.
REG OFF : The unit switches to another station, within the same network
when the receiving signals from the current station become weak. (This mode,
the program may differ from the one currently received.)
(OPTIONAL)
AF (Alternative frequency) ON/ OFF
When the reception quality drops, the tuner automatically changes to another
station in the network, broadcasting a better reception quality, using the PI
and AF codes.
SENS (Tuner sensitivity) MID/ HI /LOW
In a area in which signal reception is weak, it helps the tuner to search more
stations. The weaker the reception is, the lower option you should set to.
PS (Preset scan)
Each preset station appears. To cancel, press ENTER (Or the volume knob).
AS (Auto Store)
The six strongest broadcasting frequencies will be stored under preset button
1-6 in the order of their signal strength. To cancel, press ENTER (Or the volume
knob).
CAR CD/MP3/WMA Receiver 13