G-Shock GST-S310 - Watch CASIO - Free user manual and instructions
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| Product Type | Analog-Digital Watch |
| Brand | Casio G-Shock |
| Model | GST-S310 |
| Case Size | Approx. 55.9 × 51.9 × 16.5 mm |
| Weight | Approx. 212 g |
| Power Source | Tough Solar (Solar-charging system) |
| Water Resistance | 200 meters (20 ATM) |
| Shock Resistance | Yes (G-Shock core technology) |
| Display Type | Analog hands + Digital display |
| Band Material | Resin / Stainless steel (depending on variant) |
| Key Functions | World time (48 cities), Stopwatch, Countdown timer, Dual time, Alarm, Auto LED light, Full auto calendar, Hand shift feature, Bluetooth smartphone link |
| Accuracy | ±15 seconds per month (without signal calibration) |
| Battery Life | Approx. 5 months without exposure to light (power-saving mode) |
| Glass Type | Mineral glass |
| Maintenance and Cleaning | Wipe with a soft dry cloth; avoid harsh chemicals; rinse with fresh water after saltwater exposure. |
| Safety Precautions | Keep away from magnets and strong shocks; do not operate buttons underwater; ensure crown is pushed in before water contact. |
| Spare Parts and Reparability | Contact Casio service centers; batteries, bands, and gaskets are replaceable; use only Casio genuine parts. |
| General Information | Designed for outdoor and sports use; Bluetooth connection for phone notifications and time sync; multi-language support. |
Frequently Asked Questions - G-Shock GST-S310 CASIO
How do I set the time on my Casio G-Shock GST-S310?
You can set the time manually via the buttons or automatically by using the Bluetooth connection to your smartphone with the Casio app. For manual setting, refer to the user manual for specific button sequences.
How to charge the watch?
The GST-S310 uses Tough Solar power. Expose the watch face to bright light (sunlight or strong indoor light) for several hours to charge. Avoid prolonged exposure to high temperatures.
Is the watch water resistant?
Yes, it is water resistant to 200 meters (20 ATM). Suitable for recreational scuba diving but not for deep diving with helium gas. Do not operate buttons underwater.
How to connect the watch to my phone?
Download the Casio Watches app, enable Bluetooth on your phone, and press and hold the B button on the watch until Bluetooth icon appears. Follow the app instructions to pair.
What does the 'hand shift' function do?
The hand shift feature temporarily moves the analog hands out of the way so you can see the digital display clearly. It activates automatically when you enter certain modes.
How do I replace the battery?
This watch uses a solar rechargeable battery that is not user-replaceable. If it fails, take it to an authorized Casio service center. Do not attempt to open it yourself.
Can I use the watch without Bluetooth?
Yes, all basic functions (timekeeping, alarms, stopwatch, etc.) work independently. Bluetooth only adds smartphone notifications and automatic time adjustment.
How to adjust the band length?
The resin band can be adjusted by removing links with a small screwdriver or by using the buckle holes. For metal bands, use a pin tool or consult a professional.
What if the watch runs slow?
First, ensure the watch is sufficiently charged. If still slow, it may need time sync via Bluetooth or a multiband 6 signal (if supported). Otherwise, reset the watch or contact support.
How do I clean the watch?
Wipe with a soft dry cloth. For dirt, use a damp cloth and mild soap. Rinse with fresh water after contact with saltwater or sweat. Avoid solvents or abrasives.
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USER MANUAL G-Shock GST-S310 CASIO
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Product information
Brand : CASIO
Model : G-Shock GST-S310
Category : Watch