This Casio G-Shock GBM-2100A-1A2ER men's watch has a resin case (bio-based) and octagonal stainless steel shock-resistant octagonal. The strap is bio-based resin. Blue dial. Mineral crystal, Tough Solar movement (solar powered) and analog-digital display. Water resistance: 20 ATM. Diameter: 49.3 mm. Weight: 72 gr: Smartphone Link function. Mobile Link wireless link with Bluetooth. Application connectivity function. Automatic time adjustment. Easy watch setting. World time for approximately 300 cities. Time and place. Reminder. Phone finder. 38 time zones (38 cities + coordinated universal time), automatic daylight saving time (DST) change and local city/world time change.1/100 second stopwatch Measuring capacity: 00'00"00~59'59"99 (during the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) Measuring unit: 1/100 second (during the first 60 minutes) 1 second (after 60 minutes) Measurement modes: elapsed time and lap/fraction time.Countdown timer Unit of measurement: 1 second Countdown interval: 60 minutes Countdown start time setting range: Between 1 second and 60 minutes (1 second and 1 minute increments). 5 daily alarms. White LED light, double LED light for the dial (super-illuminator, selectable illumination duration (1.5 or 3 seconds) and luminosity) LED light for the digital display (super-illuminator, selectable illumination duration (1.5 or 3 seconds) and luminosity).Full automatic calendar (up to the year 2099). Activation or deactivation of the button press tone. Power saving (the display goes blank to save energy when the watch is left in the dark).Battery level indicator. Approximate battery operating time: 7 months with rechargeable battery (operating period with normal use without exposure to light after charging) 18 months with rechargeable battery (operating period when stored in total darkness with the power saving function activated after full charge).Accuracy: ±15 seconds per month (without Mobile Link function) Other options: Hand change function (hands move to clear view of digital display contents). 12 and 24 hour format. Date/month display change. Day display (days of the week selectable in six languages). Normal time indication: Analog: 2 hands (hour and minute hands [hand moves every 20 seconds]), 1 dial (battery level and mode) Digital: hour, minute, second, p.m., month, date and day. 3-year warranty. Enjoy your Casio G-Shock watch.