Hitachi ZAXIS 120-6 class Operator's Manual page 182

Rear Light Switch
When rear light switch (1) is turned ON, the rear light at the
rear of the cab roof comes ON.
Perimeter Lights Switch
Pressing perimeter lights switch (4) to the ON side turns on
the lights (6) on the left, right and rear of the machine.
Perimeter lights and a rear light cannot be mounted at the
same time.
Travel Alarm Deactivation Switch
The travel alarm buzzer sounds during travel operation.
When pushing the mark of travel alarm deactivation switch
(1), the travel alarm buzzer function is deactivated.
OPERATOR'S STATION
6
1-100
1
MDC1-01-501
4
MDC1-01-511
MDC1-01-572
1
M1U1-01-035