GSTS100G-1A

The GSTS100G-1A is a solar-powered analog-digital hybrid watch engineered for precision and durability. Its resin case with stainless steel bezel measures 59.1 × 52.4 × 16.1 mm and weighs just 97 grams, delivering shock resistance and 200-meter water resistance for everyday wear and water sports. Powered by Tough Solar technology, the watch delivers up to 8 months of runtime on a single charge with normal use, or 19 months in darkness with power-saving mode enabled. The dual LED illumination system—one for the analog face and one for the digital display—ensures visibility in any light condition, with adjustable duration settings and afterglow. This timepiece combines world time across 31 zones with a 1/100-second stopwatch, countdown timer, and five daily alarms. The hand-shift feature automatically moves the analog hands aside to reveal the full digital display without obstruction. A full auto-calendar runs through 2099, while the intelligent power-saving function extends battery life by blanking the display when the watch sits in darkness. Accurate to ±15 seconds per month, the GSTS100G-1A balances technical sophistication with practical everyday functionality—ideal for travelers, athletes, and professionals who demand reliability and precision.