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1. SPECIFICATIONS: MODULE QW-3721
Battery CTL1025 (Storage battery)
Note: Use CTL1025 only. Other storage battery or CR1025 can cause
damage to the watch.
Battery life Approx. 4 months
Current consumption 0.53 µA maximum: Follow the procedure described below to measure the
current consumption. Energize while pressing the B button.
Release energizing after releasing the B button.
Alarm system Piezo plate on Cover/Back
Accuracy ±20 sec./month
Accuracy setting system Chip capacitor selection
Accuracy checking See page 12
Functions • Solar powered
• Time calibration signal reception
Auto receive
Manual receive
• Time Calibration Signal
Receivable Time Calibration Signals
Fukushima, Japan (Call Sign: JJY, Frequency: 40kHz)
Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60kHz)
• Low battery warning display
• Auto-calendar
• Regular timekeeping:
Analog: 3 hands (Hour, minutes, seconds)
• LED light (with full auto light function)
• Daily alarms
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