Casio G-SHOCK Master of G GR-B300-1AJF Gravitymaster Solar Bluetooth Watch

Overview
The Casio G-SHOCK MASTER OF G AIR GRAVITYMASTER GR-B300-1AJF is a rugged, high-tech pilot’s watch designed for extreme conditions. Equipped with Tough Solar power, Bluetooth mobile link, and an extensive set of aviation-inspired features, this watch ensures precision and durability for professional and aviation enthusiasts alike.

Key Features

• Water Resistance: 20 ATM (200 meters), suitable for swimming and snorkeling

• Solar Power: Tough Solar system provides reliable solar charging for long battery life

• Bluetooth Mobile Link: Connects to your smartphone for automatic time correction, easy setting, flight log, mobile phone finder, and app linkage via “CASIO WATCHES” app

• World Time: Displays time for approximately 300 cities worldwide with dual time and home time swap

• Stopwatch: 1-second accuracy, up to 24 hours, split time measurement

• Timer: Up to 24 hours, set in 1-minute increments with 1-second precision

• Alarms: Multiple time alarms with hourly signal

• LED Light: Super Illuminator with white LED and afterglow function for visibility in low light

• Calendar: Fully automatic calendar, no need for manual date adjustment

• Power Saving: Hands stop moving in the dark to conserve battery life

• Battery Indicator: Displays battery status and warnings

• Operating Time: Approx. 5 months with functions active, 18 months in power saving mode

• Accuracy: ±15 seconds per month (if not connected to smartphone)

• Other: Date and day of week display

Specifications

• Model Number: GR-B300-1AJF

• Case Size: 59 x 54.7 x 15.7 mm

• Weight: 71 g

• Case/Bezel Material: Resin/Stainless Steel

• Band Material: Resin

• Glass: Mineral or scratch-resistant glass

Package Includes

• Casio G-SHOCK GR-B300-1AJF Watch

• Original Casio Box

• Instruction Manual