Sangean MMR-77 (V1) - Manual (Page 6)

Conditional water resistant
This radio is a water resistant device not a waterproof device,
therefore make sure the rubber cover on earphones socket
and DC jack are properly sealed after usage.
Illumination lamp
The radio equips with a illumination lamp, it can either
illuminate the dial window or illuminate for short distance
whenever is necessary. Simply press illumination button
to switch on /off the illumination lamp either radio power is
on or off.
Emergency buzzer
Press the Emergency Buzzer button will sound the
emergency buzzer to let the people know that it’s in
emergency status or something like “I am here and need
help“. Press the button again to switch off the buzzer.
Note:
The Emergency buzzer can execute either radio is in on or
off position.
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