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Round grey dial analog digital watch with bio based resin case and strap, 45.40 mm thick, 200 m water resistant

CASIO

CASIO G-Shock GA-B2100LUU-8A Grey Dial Tough Solar 200M Watch

SKU CH-GKQH-GEK26

A solar-powered analog-digital sports watch with a 45.40 mm bio-based resin case, 200 m water resistance and smartphone link

  • Watch movementSolar
  • Product shapeRound
  • Watch face colorGrey
  • Dial markingsIndex
  • Display typeAnalog Digital
  • Date displayDate
  • Bio-based resin case reduces environmental impact
  • Tough Solar movement charges from any light source
  • 200 m water resistance suits diving and swimming
  • Shock-resistant construction protects against daily impacts
  • Smartphone Link enables automatic time correction

Grey Dial Tough Solar Watch

The Casio G-Shock GA-B2100LUU-8A is a solar-powered sports watch built for daily wear and outdoor activity. Its bio-based resin case and strap reduce environmental impact while maintaining the brand’s shock-resistant construction. The analog-digital display shows month, day and date at a glance. It suits anyone wanting a tough, low-maintenance timepiece with 200-metre water resistance.

200-Metre Water Resistance and Solar Power

The 200 m rating covers swimming, snorkelling and surface water sports, but not scuba diving with compressed air. Tough Solar charges the battery from any light source, removing the need for regular cell changes. Power reserve lasts months in darkness once fully charged. The fixed bezel and mineral crystal protect the dial from knocks and scratches during active use.

Smartphone Link Limits

Bluetooth smartphone link enables automatic time correction, world-time setting and alarm management through the Casio Watches app. The connection requires a compatible phone and the app running in the background. It does not deliver call, message or notification alerts on the watch face. Firmware updates are not supported over the link.

How it compares

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

Price $133.99
Typical for this category: the median of 2,679 items is $130.99.

Specifications

Product
Brand nameCASIO
Design styleSports
Watch face colorGrey
Item conditionNew
Display
Display typeAnalog Digital
Size & build
Main materialResin
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Housing materialResin
Case size45.4 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementSolar
Dial markingsIndex
Date displayDate
Suitable forMale

Questions about this item

Will the 45.40 mm case sit comfortably alongside a vintage 40 mm diver on the same wrist?

The 45.40 mm resin case is larger than a classic 40 mm diver, so it will feel noticeably bigger and heavier on the same wrist.

How can I confirm the Tough Solar movement is charging correctly after first exposure to light?

The analog-digital display shows a charge-level indicator; a rising bar or "H" symbol confirms the solar cell is converting light into power.

Does the box include a heart-rate sensor or charging cable, or must I buy them separately?

The package contains the watch with bio-based resin strap, buckle clasp and manual; no heart-rate sensor or charging cable is supplied or required.

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