G-Shock MRG-8100B-1A - Manual (Page 83)

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Specifications
Quartz Oscillation Frequency: 32,768Hz
Accuracy: Within an average of ±15 seconds per month when time
calibration signal reception is not performed
Basic Functions: Hour, minute (moves every 10 seconds), second;
24-hour timekeeping; date; day of the week
Radio-controlled Watch Functions: Auto receive; manual receive
Last reception result
Auto standard time/summer time switching
Auto transmitter selection (for JJY, MSF/DCF77)
Transmitters
Call Signs: JJY (40kHz/60kHz), BPC (68.5kHz),
WWVB (60kHz), MSF (60kHz), DCF77
(77.5kHz)
Stopwatch: Measuring unit: 1/20 second
Measuring Capacity: 23:59'59.95" (24 hours)
Measurement Functions: Elapsed time, split times,
cumulative time