Casio G-Shock wristwatch Bluetooth solar features model GA-B2100-1A1JF black men.

The GA-2100 inherits the design concept of the original G-SHOCK, maintaining its octagonal form while incorporating smartphone linking and Tough Solar technology. To accommodate the increased number of components due to enhanced functionality, a newly developed slim module optimizes the circuit board layout. Combined with a carbon core guard structure, it retains the size feel of previous models. The colors of the blue, green, and yellow case and band revive the "first color" first adopted in the 5600 series. The blue, green, and all-black models feature a minimalistic color scheme. - Shock-resistant structure - Tough Solar (solar charging system) - 20-bar water resistance - Mobile link function (functionality linked via Bluetooth® communication with compatible mobile phones) - Hand retreat function (the hands can temporarily move away from the LCD display for better visibility) - World time: time display for 38 cities (38 time zones, automatic daylight saving time setting) + UTC (Coordinated Universal Time) with home time city swapping - Stopwatch (1/100 second for under 1 hour / 1 second for over 1 hour, 24-hour measurement, with lap/split function) - Timer (set unit: 1 second, maximum set: 60 minutes, measured in 1-second increments) - 5 time alarms and hourly chime - Battery indicator display - Power saving function (display turns off after a certain time in dark environments to save power) - Full auto calendar - 12/24 hour format switch - Operation sound ON/OFF switch - Date display (month/day switch) - Day of the week display (switchable in six languages: English, Spanish, French, German, Italian, Russian) - Double LED light: LED light for the dial (super illuminator, afterglow function, afterglow time switch (1.5 seconds/3 seconds)), LED backlight for the LCD section (super illuminator, afterglow function, afterglow time switch (1.5 seconds/3 seconds)) Mobile link function includes automatic time correction, easy watch settings, world time for about 300 cities, mobile phone search, and time & place reminders. To connect with a smartphone, the dedicated app "G-SHOCK WATCHES" must be installed. It is compatible with specified iPhone and Android smartphones. For details on compatible devices and OS support, please check the manufacturer's website. Bluetooth functionality is limited to devices equipped with Bluetooth. The watch has established a