
GSTB300S-1A

GSTB300S-1A

A new Carbon Core Guard structure for GST-B300, which protects the module with a carbon case. Highly durable carbon fiber-reinforced resin is added not only to the center case, but also to the front and side button guards, providing even stronger resistance to shocks from above or below, or from any side.

CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.

The battery indicator at the 6 o’clock position, designed to evoke a brake disk, shows the remaining battery power by an arrow pointer and a curved red bar, providing visually interesting ways to check the battery.


* Updating of internal data according to the latest time zone/ daylight saving time information
* The Bluetooth® wordmark and logo are registered trademarks of Bluetooth SIG, Inc. and any use of these marks by Casio Computer Co., Ltd. is under license.
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* All other company and product names are trademarks or registered trademarks of their respective owners.
* List of Countries and Geographic Areas where Product Conforms to Radio Laws or Has Been Approved.
Links with a smartphone for more accurate timekeeping and access to a host of mobile link functions.
CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.
A light emitting diode is used to illuminate the face/display. Super Illuminator uses high-brightness LED for easier reading
Simultaneous display of the current time in two different time zones
The daily alarm sounds each day at the time you set. The value indicates how many alarms are available. The hourly time signal causes the watch to beep every hour on the hour
Accurate measurement of elapsed time with the touch of a button. The fraction indicates the unit of measurement, while the time figure indicates the maximum time measurement
Counts down from a start time specified by you. The value indicates the number of timers available, while the time figure indicates the maximum starting time. “REPEAT” indicates Auto Repeat, which automatically restarts timing at the end of each countdown
Beeper tone alarm sounds at the time you set
Allowances are made automatically for months of different lengths, including leap year
Times can be displayed in either 12-hour or 24-hour format
Indicator shows the current battery level
Shock-resistant construction protects against impact and vibration
The “BAR” value indicates the number of atmospheres to which water resistance is ensured. 20 BAR means water resistance to 20 atmospheres. Watches marked “200m” have the same water resistance as 20 BAR watches
Hard glass resists scratching
Screw-Lock
Resin