• CASIO GMD-B300-7JF
  • GMD-B300-7
  • GMD-B300-7
  • GMD-B300-2 エフォートレスに着こなす カジュアルスタイル
  • GMD-B300-2 装着感の高い コンパクト＆スリム
  • Official CASIO feature illustration; pictured model: GMD-B300-1
  • From left: GMD-B300-7, GMD-B300-2
  • From left: GMD-B300-2, GMD-B300-7
1 8

CASIO · JAPANESE-MARKET REFERENCE

GMD-B300-7JF

GMD-B300-7JF

¥18,804 JPY
¥18,804 JPY
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Taxes included. Shipping calculated at checkout.

This compact step-tracking G-SHOCK uses a coordinated single-color finish that works with sportswear and casual clothing. Metallic printing on the glass adds detail to the face. Step counting starts automatically when you walk, and the display shows daily steps and progress toward your target. Recorded data can be transferred to the dedicated smartphone app for activity tracking. Major resin components in the bezel and band use bio-based resin.

Reference
GMD-B300-7JF
Case (H × W × D)
46.4 × 43.8 × 12 mm
Weight
41 g
Listed water resistance
20-bar water resistance

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Before & after your purchase

Read our shipping and return information before ordering. Model-specific warranty and repair guidance is available below.

Buying from JapanSize & function guide
Setup & support

Model reference: GMD-B300-7JF

Search the official manual using this model or the module number on your watch.

Find the official CASIO manual
Before you choose

Warranty & service

Local warranty service outside Japan is not guaranteed. Read our return and repair policy and ask about your exact reference before ordering.

Bracelet fit & adjustments

Check the case dimensions and band details in the specifications. Ask us about fit, included links and adjustment options before placing an order.

Packaging & included items

Included items can vary by reference. Contact us with the model number to confirm the box, documents and accessories.

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Order help & returns

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Product details
Model
GMD-B300-7JF
JAN / EAN
4549526422720
Band material
Resin band
Crystal material
Mineral glass
Weight
41 g
Case size (L × W × H)
46.4 × 43.8 × 12 mm
Price
¥18,804 JPY
Country of origin
JP

Specifications

Release date May 2026
Case size (H × W × D) 46.4 × 43.8 × 12 mm
Weight 41 g
Case and bezel material Resin / bio-based resin
Band Bio-based resin band
Construction Shock resistant
Water resistance 20-bar water resistance
Time adjustment Bluetooth: connects to a smartphone for automatic time adjustment
Power supply and battery life Approx. battery life: 2 years
Sensors Step counting: 0–999,999 steps; Goal achievement display, with targets from 1,000 to 50,000 steps in 1,000-step increments; Seven-hour step graph with hourly activity shown in six levels; Step indicator

Exterior details

Glass Mineral glass
Compatible wrist size 145–190mm

Watch functions

World time Dual time with home time swapping
Stopwatch Stopwatch: 1/100 second for the first hour, 1 second thereafter; 24-hour capacity; lap / split time; up to 200 records (year, month, day, hour, minute, lap / split time); target time alerts with up to 10 targets (1-second setting increments, maximum 23 hours 59 minutes 59 seconds)
Timer Interval timer with up to 5 time settings: 1-second setting increments, maximum 60 minutes, 1-second measurement, auto-repeat, auto-start
Alarm 5 daily alarms and hourly time signal
Light LED backlight: auto light, Super Illuminator, afterglow, selectable illumination duration (1.5 seconds / 3 seconds)
Light color LED: white
Calendar Full auto-calendar
Button operation tone Button operation tone on/off
Power saving Power saving on/off
Battery indicator and alerts Low battery alert
Accuracy Without smartphone connection, the watch operates at normal quartz accuracy (±15 seconds per month).
Other features 12/24-hour format
Mobile Link Bluetooth connectivity with a compatible smartphone
Compatible app CASIO WATCHES
App functions Automatic time adjustment; Easy watch settings; World time: approximately 300 cities; Life-log data; Stopwatch data transfer; App information; Time & Place; Phone finder
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