Casio G-Shock GMD-B300-1 / GMD-B300-3 / GMD-B300-4

Specifications
- Shock resistant
- 20 bar water resistant
- Keeps yourself in time
- Easy to operate via smartphone
- Lets you know the number of steps
- Well-matched with sportswear

Basic Information
- Case size (L× W× H)
  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
  200-meter water resistance
- Bluetooth: Connects to a smartphone and automatically adjusts the time
- Power supply and battery life
  Approx. battery life: 2 years on CR2016
- Sensor feature
  Step Count Measurement

Smartphone Link/App Connectivity Features
- Smartphone Link feature
  Mobile link (Wireless linking using Bluetooth®)
- Apps
  CASIO WATCHES
- App connectivity feature
  Auto time adjustment
  Easy watch setting
  Approximately 300 world time cities
  Life log data
  Stopwatch data transfer
  App information
  Time & place
  Phone finder

Exterior
- Glass
  Mineral Glass
- Compatible band size
  145 to 190 mm

Watch Features
- Dual time (home time swapping)
- Stopwatch
- Timer
- Alarm/hourly time signal
  5 daily alarms
  Hourly time signal
- Light
  LED backlight (Super Illuminator)
  Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
- LED:White
- Full auto-calendar (to year 2099)
- Button operation tone on/off
- Power Saving on/off
- Low battery alert
- Accuracy: ±15 seconds per month (with no mobile link function)
- Other features
  12/24-hour format