Casio GB-6900B User's Manual For Watch Functions page 21

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2
 U seCtoselecttheitemwhosesettingyouwanttochange.
 E achpressofCcyclesthroughavailablesettingsinthesequenceshownbelow.
TimeZone
C
12
PowerSaving
C
11
Alarm/TimerAlarm
C
10
Displayilluminationduration
E-20
1
C
Summertime
5
6
2
C
12/24-hourtimekeeping
4
Minute
C
C
7
C
Year
9
Operationtoneon/off
C
3
Hour
C
8
C
Month
C
Seconds
Day
C