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Round black digital watch with resin case and strap, buckle clasp, 43.80 mm case thickness, 200 m water resistance

CASIO

CASIO G-SHOCK G-SQUAD GMD-B300-1 200M 43.80mm Ladies Watch

SKU CH-3MQ5-47N37

Digital sports watch with smartphone link, bio-based resin strap, shock resistance and 200 m water resistance

  • Watch movementQuartz
  • Product shapeRound
  • Watch face colorBlack
  • Display typeDigital
  • Date displayDate
  • Strap materialResin
  • 200 m water resistance handles swimming and surfing
  • Bio-based resin strap reduces petroleum-based material use
  • Shock-resistant construction protects the module from daily impacts
  • Smartphone link syncs step-count data to your phone
  • 80 mm case fits smaller wrists comfortably

Built for Active Women

The Casio G-SHOCK G-SQUAD GMD-B300-1 is a 43.80mm digital sports watch designed for women who track daily activity. A resin case and bio-based resin strap keep the profile light on the wrist. Quartz movement drives the black digital display with day and date readouts. Water resistance to 200m covers swimming and surface water sports.

Shock Resistant Everyday Wear

Mineral crystal protects the module from knocks while the fixed bezel holds the seal at depth. The buckle clasp secures the strap during high-intensity movement. No thermals, noise or power draw apply to a battery-powered quartz watch; the movement runs silently with no charging routine. Shock-resistant construction absorbs daily impacts without drift.

Step Tracking With Phone Sync

This model adds Bluetooth step counting and smartphone link so you can review trends without a dedicated fitness band. It replaces a basic digital watch when you want automatic activity logs and notifications on the same screen. The jump is worth it if you need 200m water resistance plus connected features in one compact resin package.

How it compares

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

Price $91.99
Cheaper than about 60% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Design styleSports
Watch face colorBlack
Item conditionNew
Display
Display typeDigital
Size & build
Main materialResin
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Housing materialResin
Case size43.8 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementQuartz
Date displayDate
Suitable forFemale

Questions about this item

How do I pair the GMD-B300-1 with my smartphone for step tracking?

Install the CASIO G-SHOCK Connected app, enable Bluetooth on your phone, then hold the watch's adjust button until the pairing screen appears; the step people miss is granting the app background location permission so sync continues when the phone sleeps.

What part of the GMD-B300-1 will need replacement first with daily wear?

The bio-based resin strap typically shows surface wear before the mineral crystal or resin case; CASIO stocks replacement straps in the same lug width for easy swap.

At what depth does the 200 m water-resistance limit of the GMD-B300-1 become a concern during prolonged swimming?

The 200 m rating covers recreational diving and extended surface swimming; the practical limit that appears first is the crown seal — always verify the buckle clasp is fully secured before submerging.

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