Casio G-SHOCK GA-B2100 Series Analog Digital Watch

The Casio G-SHOCK GA-B2100 Series retains the iconic octagonal design of the 2100 line while adding advanced functionality with Bluetooth® Smartphone Link and Tough Solar charging. Built with the lightweight Carbon Core Guard structure, the watch delivers exceptional durability without compromising comfort. Smartphone connectivity through the CASIO WATCHES app enables automatic time adjustment, world time settings, reminders, and phone finder functionality. With 200-meter water resistance, shock-resistant construction, and a high-brightness Super Illuminator Double LED Light, the GA-B2100 Series combines modern technology with G-SHOCK's signature toughness in a slim, minimalist design. The FC models further enhance the look with colorful accent details inspired by confetti, adding a playful touch to the classic octagonal silhouette. 

Key Features:

• G-SHOCK 2100 Series 

• Analog-Digital display 

• Iconic octagonal bezel design 

• Carbon Core Guard Structure 

• Shock Resistant construction 

• 200-meter water resistance 

• Tough Solar (Solar powered) 

• Bluetooth® Smartphone Link 

• Mobile Link (Wireless linking using Bluetooth®) 

• Compatible with CASIO WATCHES app 

• Auto Time Adjustment 

• Easy Watch Setting 

• Approximately 300 World Time Cities 

• Time & Place 

• Reminder 

• Phone Finder 

• Mineral Glass 

• Neobrite 

• World Time (38 time zones) 

• 1/100-second Stopwatch 

• Countdown Timer 

• 5 Daily Alarms 

• Hourly Time Signal 

• Double LED Light (Super Illuminator) 

• Selectable illumination duration 

• Afterglow 

• Full Auto Calendar (to year 2099) 

• Hand Shift Feature 

• Power Saving 

• Battery Level Indicator 

• Button operation tone On/Off 

• Date/Month display swapping 

• Day display in six languages 

• 12/24-hour time format 

• Easy to see in darkness 

Technical Specification:

• Brand: Casio 

• Series: G-SHOCK 2100 Series 

• Models Covered: GA-B2100-1A, GA-B2100FC-1A, GA-B2100FC-3A, GA-B2100FC-7A 

• Product Category: Analog-Digital Watch 

• Gender: Not specified on the official product pages 

• Case Size (L × W × H): 48.5 × 45.4 × 11.9 mm 

• Weight: 52 g 

• Case & Bezel Material: Carbon / Resin 

• Band Material: Resin Band 

• Construction: Shock Resistant, Carbon Core Guard Structure 

• Water Resistance: 200-meter water resistance 

• Time Adjustment: Bluetooth® smartphone automatic time adjustment 

• Power Supply: Tough Solar (Solar powered) 

• Smartphone Link: Mobile Link (Wireless linking using Bluetooth®) 

• Compatible App: CASIO WATCHES 

• App Features: 

• Auto Time Adjustment 

• Easy Watch Setting 

• Approximately 300 World Time Cities 

• Time & Place 

• Reminder 

• Phone Finder 

• Glass Material: Mineral Glass 

• Compatible Band Size: 145–215 mm 

• Other Exterior Feature: Neobrite 

• World Time: 38 time zones (38 cities + Coordinated Universal Time), city code display, city name display, daylight saving on/off, Auto DST switching, Home City/World Time city swapping 

• Stopwatch: 1/100-second stopwatch; measuring capacity 00'00''00–59'59''99 (first 60 minutes), 1:00'00–23:59'59 (after 60 minutes); elapsed time, lap/split time 

• Countdown Timer: 1-second measuring unit; countdown range 60 minutes; start time setting from 1 second to 60 minutes (1-second and 1-minute increments) 

• Alarms: 5 Daily Alarms 

• Hourly Time Signal: Yes 

• Light: Double LED Light (Super Illuminator) 

• LED light for the face 

• LED backlight for the digital display 

• Selectable illumination duration (1.5 or 3 seconds) 

• Afterglow 

• LED Color: White 

• Calendar: Full Auto Calendar (to year 2099) 

• Power Saving: Display blanks automatically when left in the dark 

• Battery Level Indicator: Yes 

Battery Operating Time

• Approx. 7 months on rechargeable battery with normal use after full charge and no further light exposure 

• Approx. 18 months in total darkness with Power Saving enabled after full charge 

• Mute Feature: Button operation tone On/Off 

• Accuracy: ±15 seconds per month (without Mobile Link) 

• Hand Shift Feature: Hands move out of the way for an unobstructed view of the digital display 

• Time Format: 12/24-hour 

• Date Display: Date/Month display swapping 

• Day Display: Selectable in six languages 

Regular Timekeeping

• Analog: 2 hands (hour, minute; minute hand moves every 20 seconds), 1 dial (battery level, mode) 

• Digital: Hour, minute, second, PM, month, date, day