This black ion-plated model with an edge unique to the GST-B100 series and a tough, sporty finish, is based on a G-STEEL model designed with a motif of heavy jet engine blades and features a solid case equipped with an analog chronograph, as well as a urethane band. A dual-coil motor in a rotating disc dial placed at 9 o'clock moves the dial blades and exudes a functional beauty. In addition to the alarm on/off function and using the rotation to show the stopwatch, etc., it also functions as a battery indicator, contributing to a tough chronograph. The layer guard structure and high-density mounting technology have allowed the module to be smaller and thinner, improving wearability and overall watch quality. It is also equipped with Bluetooth® connectivity that enables accurate time acquisition via your smartphone. Its Tough Solar feature allows it to run stably, and it is also equipped with practical functions such as high-brightness LEDs and dual-dial world time. FEATURES World time Stopwatch:1-second stopwatch Countdown range:1 minute to 24 hours (1-minute increments and 1-hour increments) Alarm/hourly time signal Daily alarm LED light (Super Illuminator) Afterglow Full auto-calendar (to year 2099) Energy saving feature Power Saving (hands stop to save power when the watch is left in the dark) Battery display/alert Battery level indicator Approx. battery operating time: 5 months on rechargeable battery (operation period with normal use without exposure to light after charge) 24 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy: ±15 seconds per month (with no mobile link function) Other features Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day) Date display Day indicator Operation Guide