Casio G-Shock Master of G Gravitymaster GR-B300H-5AER

The carbon-fiber-reinforced resin case and light yellow gold IP metal bezel, inspired by new-generation aircraft, create a bold and sophisticated design. The large three-dimensional indices enhance readability, while the app allows quick switching between home time and local time during travel.

The innovative rotating disc indicator at 9 o'clock, driven by a dual-coil motor, displays the alarm status, functions as a stopwatch, and indicates the battery level. The dark brown resin strap completes the technical and distinctive character of the model.

Technical Specifications

Case

Dimensions: 59 × 54.7 × 15.7 mm
Weight: 71 g
Material: Bio-based carbon, bio-based resin, and stainless steel
Structure: Shock-resistant, Carbon Core Guard structure
Crown: Screw-lock crown
Surface treatment: Light yellow gold ion-plated bezel
Glass: Mineral
Water resistance: 20 bar
Neobrite: Yes

Strap

Material: Bio-based resin
Color: Not specified
Adjustable length: 145 to 215 mm

Power Supply

Technology: Tough Solar (solar-powered)
Power saving: Hands stop to save power when the watch is left in the dark
Indicator: Battery level indicator
Battery life: Approximately 5 months on rechargeable battery with normal use without further light exposure after charge; approximately 18 months when stored in total darkness with power saving on after full charge

Smartphone Link

Technology: Mobile Link, wireless linking via Bluetooth®
App: CASIO WATCHES
Functions: Automatic time adjustment, easy watch setting, world time for approximately 300 cities, flight log, phone finder function

World Time

Function: Dual time with city swapping for home time

Stopwatch

Measuring unit: 1 second
Measuring capacity: 23:59'59"
Modes: Elapsed time, split time

Timer

Measuring unit: 1 second
Range: 24 hours
Start time setting: 1 minute to 24 hours, with 1-minute and 1-hour increments

Alarm

Function: Daily alarm sound reminder

Illumination

Type: Super Illuminator LED light
LED Color: White

Calendar

Type: Full auto-calendar up to 2099
Display: Date

Accuracy

Deviation: ±15 seconds per month without Mobile Link function

Time Display

Type: Analog
Hands: 3 hands for hour, minute, and second
Minute hand: Moves every 10 seconds
Dials: 3 dials for dual time hour and minute, dual time 24-hour, and day of the week