List Price: $120
Size: Small
Dimensions (L x W x H): 46.4 x 43.8 x 12 mm
Weight:Â 41 grams
Module: 3567 (instruction manual at casio.com)
Battery (Lifespan): CR2016 (approx. 2 years)
Series Launch Year: 2024
Notable Features: Step Tracker, Bluetooth Mobile Link, 200-Lap Memory, Stopwatch Target Time Alarm, Interval Timer
See full specifications for GMD-B300-4 under “Additional information” tab above.
Suggested Uses: Fitness, Outdoors
Buy GMDB300
Casio
Recent GMD-B300 Releases:
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GMD-B300SC-2 (casio.com/us)
GMD-B300SC-4 (casio.com/us)
GMD-B300SC-7 (casio.com/us)
GMD-B300 Versus GD-B500 and GDB-300
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Like the GD-B500, the GMD-B300 is a compact and lightweight unisex watch with a step counter and Bluetooth smartphone link, but with a stylish 2100-inspired octagonal bezel like the larger G-SQUAD GBD-300. It has the similar functions as the GD-B500, including step-counting data with daily goal setting and progress display, dual time, stopwatch with 200-lap memory, countdown timer, 5 daily alarms, and auto LED backlight. A feature that the GD-B500 lacks is the interval timer featuring 5 time settings from 1 second to 60 minutes with auto repeat (up to 20) and auto start (5-second pre-count). Another advantage over the GD-B500 is the target time alarm for the stopwatch, which allows up to 10 target time settings with the watch beeping for 10 seconds when a target time is reached.

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G-SHOCK
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In stock
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Small
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46.4 x 43.8 x 12
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41
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200-Meter Water Resistance, Shock Resistant
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Resin
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Resin, Bio-Based Resin
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Resin, Bio-Based Resin
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Mineral
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CR2016
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2 Years
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Power Save
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Low Battery Alert
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Bluetooth Mobile Link
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Step Counter
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Casio Watches
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Alarm Settings, Auto Summer Time (DST) Switching, Auto Time Correction, One-Touch Time Correction, Phone Finder, Step Count Data Transfer, Stopwatch Data Transfer, Time & Place Log, Timer Settings, World Time (approx. 300 cities)
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Dual Time
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Lap Memory (200), Stopwatch, Target Time Alarm (10)
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1 second (after first hour), 1/100 second (first hour)
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23:59’59”
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elapsed time, lap times, split time
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Auto Start, Auto-repeat (1 to 20), Countdown Timer, Intervals (1 to 5)
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1 second
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60 minutes
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1 second to 60 minutes
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1 second
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5 Daily
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Hourly Time Signal
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1.5 or 3 Second Afterglow, Auto, LCD Backlight, LED, Super Illuminator
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White
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Full Auto Calendar to 2099
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Button Tone On/Off
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12/24-Hour Format
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145 to 190
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Alarm, Dual Time, Includes Seconds, Stopwatch
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The G-Shock GD-B500 is a unique fitness-oriented model equipped with Bluetooth smartphone link, a step counter, and a 200-record lap memory. It is also notable for its very light weight and slim size. At 11 millimeters thick, it is currently the thinnest men’s G-Shock watch. The band is designed to fit a large range of wrist sizes (from 5.7 to 7.9 inches), making it suitable for women too.
A daily step goal (from 1,000 to 50,0000) can be set and tracked automatically by the watch, with the goal progress viewable as a graph on the watch display in timekeeping mode. There are also indicators for goal attainment and (optional) step reminder. The step count data and lap records can be transferred to the smartphone app with Bluetooth for viewing, where the 24-hour and weekly step counts are viewable, along with calories burned for each step count category. The daily step count is also viewable on the watch and offers a step count graph for the past seven hours plus the current hour, along with the total step count number. Lap records with lap and split time are viewable on the watch, as well as the phone app.

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G-SHOCK
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In stock
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Small
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46.3 x 41.5 x 11
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45
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200-Meter Water Resistance, Shock Resistant
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Resin, Glass Fiber
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Resin
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Resin
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Mineral
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CR2016
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2 Years
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Power Save
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Low Battery Alert
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Bluetooth Mobile Link
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Step Counter
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Casio Watches
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Alarm Settings, Auto Summer Time (DST) Switching, Auto Time Correction, One-Touch Time Correction, Phone Finder, Step Count Data Transfer, Stopwatch Data Transfer, Time & Place Log, Timer Settings, World Time (approx. 300 cities)
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Dual Time
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Lap Memory (200), Stopwatch
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1 second (after first hour), 1/100 second (first hour)
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23:59’59”
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elapsed time, lap times, split time
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Countdown Timer
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1 second
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60 minutes
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1 second to 60 minutes
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1 second
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5 Daily
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Hourly Time Signal
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1.5 or 3 Second Afterglow, Auto, LCD Backlight, LED, Super Illuminator
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White
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Full Auto Calendar to 2099
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Button Tone On/Off
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12/24-Hour Format
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145 to 200
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Alarm, Countdown Timer, None
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The G-Shock GBD-300 is the slimmest G-SQUAD fitness series (as of July 2024) and features an octagonal bezel inspired by the G-Shock GA-2100. With its high-contrast MIP LCD display, step counter, and Bluetooth smartphone connectivity, it offers the same walking and running log functions as the GBD-200, along with other practical features such as phone notifications and vibrating alerts.

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G-SHOCK
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In stock
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Medium
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48.9 x 47.4 x 14.9
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60
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200-Meter Water Resistance, Shock Resistant
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Resin
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Resin, Bio-Based Resin
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Resin, Bio-Based Resin
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Mineral
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CR2032
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2 Years
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Power Save
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Bluetooth Mobile Link
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Step Counter
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G-Shock Move
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Auto Summer Time (DST) Switching, Data Update (Time Zone and DST rules), Phone Finder, Phone Notifications, Training Log Data Management
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World Time
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Stopwatch
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1 second
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99:59’59”
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elapsed time, split time
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Auto-repeat (1 to 20), Countdown Timer, Intervals (1 to 5)
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1 second
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60 minutes
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1 second to 60 minutes
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1 second
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4 Daily (with Snooze)
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1.5 or 3 Second Afterglow, Auto, LCD Backlight, LED, Super Illuminator
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White
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Full Auto Calendar to 2099
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Button Tone On/Off
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12/24-Hour Format
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145 to 215
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Alarm, Countdown Timer, Stopwatch, Training, World Time
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MIP LCD
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Vibration
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Auto Pause, Auto/Manual Lap, Target Alert (time, calories burned), Training Display Customization
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38
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38 + UTC
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Auto DST Switching, DST On/Off
Some specs for individual models may differ within a series, such as price, materials, weight, etc. Specs are subject to change and are not guaranteed to be accurate here. Dollar prices are in U.S. currency unless otherwise noted. Click the link icons in the gallery images to view our articles on specific models. Gallery images labeled with "(casio.com)" are linked to an official Casio product page. Follow your country's official G-Shock site (gshock.casio.com) for specs on individual models and more release information.
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