Sangean RCR-2 (V1) - Manual (Page 16)

15
SLEEP – auto shut off
Continuously pressing the Power button 1 will activate the sleep
function, the radio will switch off automatically in 15 minutes step
from 15-120. The Sleep control begins when you release the key
and display will appear. After the minutes which selected, the radio
turns itself off automatically. If you wish to turn off the radio
beforehand, press Power on/off button 1.
Headphones
The radio provides a Headphones socket to connect the
headphones set. When plug in the headphones, the speaker
is disconnected.
Alarm level adjustment
With alarm level adjustment switch 5, you may select required alarm
signal level.
Note:
Alarm level adjustment works only for buzzer alarm.
Display backlight on/off
Key 4 provides you to select whether you require to illuminate
the display.