Dead batteries and drifting time shouldn't be your problem. The Casio G-SHOCK GA-B2100 Analogue-Digital Watch charges from light and syncs with your phone to stay accurate on its own.
Its slim octagonal case uses carbon fibre-reinforced resin for strength at just 52 g, with mineral glass protecting the dial.
· Carbon Core Guard Structure: A shock-resistant, carbon fibre-reinforced case protects the module against hard impacts.
· 200 m Water Resistance: Rated to 20 bar for rain, washdowns, and swimming.
· Tough Solar Power: Runs approximately 7 months on a full charge without light, with a battery level indicator on the dial.
· Bluetooth Smartphone Link: Connects to the CASIO WATCHES app for automatic time adjustment, reminders, and phone finder.
· Double LED Super Illuminator: White LEDs light both the face and the digital display, with afterglow for reading in the dark.
Specifications
Case Size (L × W × H): 48.5 × 45.4 × 11.9 mm
Compatible Band Size: 145 to 215 mm
Stopwatch: 1/100-second, up to 23:59'59
Countdown Timer: Up to 60 minutes
World Time: 38 cities plus UTC, auto DST switching
Alarms: 5 daily alarms, hourly time signal
Hand Shift: Moves the hands clear of the digital display
Accuracy: ±15 seconds per month (without mobile link)
Strap on the Casio G-SHOCK GA-B2100 Analogue-Digital Watch and let it handle the upkeep while you handle the job.
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