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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

  • Watch movementQuartz
  • Product shapeRound
  • Watch face colorBlack
  • Display typeDigital
  • Date displayDate
  • Chronograph functionChronograph
  • 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.

How it compares

Measured against everything we stock in Analog & Digital Wristwatches, at today’s prices. Recalculated every night.

Price $127.99
Typical for this category: the median of 2,679 items is $130.99.

Specifications

Product
Brand nameCASIO
Model nameGW7900B-1
Design styleSports
Product colorBlack
Watch face colorBlack
Item conditionNew
Display
Display typeDigital
Size & build
Main materialPlastic
Size adjustmentNo
Product shapeRound
Strap materialRubber
Strap length7
Strap width21
Closure typeBuckle
Case size50
Watch glassMineral Crystal
Size or dimensions50 mm wide by 16 mm thick
Environment & compliance
Water resistance200m
More details
Watch movementQuartz
AdjustabilityNo
Date displayDate
Chronograph functionChronograph
Suitable forMale
Age groupAdult
Alarm functionYes
Global composite sports typeWristwatches

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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