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Black round digital watch with resin case and rubber strap, solar-powered atomic timekeeping

CASIO

CASIO GW7900B-1 G-Rescue Solar Atomic Watch

SKU CH-5DEW-A9XD9 MPN GW7900B-1

Solar-powered digital sports watch with atomic timekeeping, 48 world-time cities, tide and moon data, 1/100-second stopwatch, 200 m water resistance and 50 mm resin case

  • StyleSports
  • MaterialPlastic
  • MovementQuartz
  • ColorBlack
  • ResizableNo
  • AdjustableNo
  • Solar charging keeps the watch running without battery changes
  • Atomic Multi-Band 6 signal syncs the time automatically worldwide
  • 200 m water resistance suits serious surface water sports
  • Tide and moon graphs help plan coastal activities
  • 48-city world time with 31 zones covers global travel

Solar Atomic Sports Watch

The CASIO GW7900B-1 is a solar-powered digital sports watch with Multi-Band 6 atomic timekeeping. It receives radio signals for automatic time correction across 31 zones and displays world time in 48 cities. The 50 mm resin case houses a black digital display with an EL backlight. Water resistance is rated to 200 metres, making it suitable for serious surface water sports and professional marine activity.

Built for Outdoor Professionals

This watch suits users who need reliable timekeeping without battery changes and who value tide and moon data for coastal activities. The large buttons and four-point protection design allow operation with gloves. Buyers who want a metal bracelet, a smaller case diameter, or smartwatch connectivity such as notifications or GPS tracking should look at other models.

Integrates into a Rugged Kit

The resin band with buckle fastener secures the watch over wetsuits or heavy sleeves. Solar charging removes the need to carry spare cells on extended trips. The 1/100-second stopwatch, countdown timer, and daily alarms with snooze support interval training and watchkeeping schedules. Mineral crystal protects the dial from scratches during daily wear.

Highlights

  • Solar charging keeps the watch running without battery changes
  • Atomic Multi-Band 6 signal syncs the time automatically worldwide
  • 200 m water resistance suits serious surface water sports
  • Tide and moon graphs help plan coastal activities
  • 48-city world time with 31 zones covers global travel

Specifications

BrandCASIO
ModelGW7900B-1
StyleSports
MaterialPlastic
MovementQuartz
ColorBlack
ResizableNo
AdjustableNo
ShapeRound
Dial ColorBlack
DisplayDigital
DateDate
ChronographChronograph
Band MaterialRubber
Band Length7
Band Width21
FastenerBuckle
GenderMale
AgeAdult
ConditionNew
Case Diameter50
Case Thickness16mm
CrystalMineral Crystal
Water-Resistant200m
AlarmYes
Global Composite Sports TypeWristwatches
Size/Dimensions50mm wide by 16mm thick

Questions about this item

Does this watch need a smartphone or computer to receive its atomic time signal?

No, the watch uses Multi-Band 6 radio reception to sync automatically with atomic clocks in 6 regions worldwide.

Can I wear my existing 21 mm rubber straps on this 50 mm case?

The band width is 21 mm, so any compatible 21 mm strap will fit the lugs.

How do I confirm the solar charging and atomic sync are active after setup?

The digital display shows a charge-level indicator and a reception-success icon when both functions are working.

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