Casio G-SHOCK 2100 Series Steel Bluetooth Tough Solar Watch (GBM-2100A-1A2ER)

Overview

The Casio G-SHOCK GBM-2100A-1A2ER combines the iconic octagonal “CasiOak” design with a refined metal bezel and modern functionality. Featuring Tough Solar power and Bluetooth® Smartphone Link, it offers reliable, low-maintenance timekeeping with automatic updates via the CASIO WATCHES app. Built with shock resistance and 200-metre water resistance, it delivers everyday durability alongside practical features including world time, stopwatch, countdown timer and alarms, supported by double LED illumination for clear visibility. :contentReference[oaicite:0]{index=0}

Key Features

• Shock-resistant construction
• Tough Solar (solar powered)
• Bluetooth® Smartphone Link (Mobile Link) with CASIO WATCHES app
• 200-metre water resistance
• World time (38 time zones, auto DST switching)
• 1/100-second stopwatch with lap/split timing
• Countdown timer (up to 60 minutes)
• Five daily alarms and hourly time signal
• Double LED light (Super Illuminator) for dial and digital display
• Battery level indicator and Power Saving function
• Hand shift feature for unobstructed digital display

Specifications

• Case size (L×W×H): 49.3 × 44.4 × 11.9 mm :contentReference[oaicite:1]{index=1}
• Weight: 72 g :contentReference[oaicite:2]{index=2}
• Case and bezel material: Bio-based resin / stainless steel :contentReference[oaicite:3]{index=3}
• Band: Bio-based resin band :contentReference[oaicite:4]{index=4}
• Construction: Shock resistant :contentReference[oaicite:5]{index=5}
• Water resistance: 200-metre water resistance :contentReference[oaicite:6]{index=6}
• Time adjustment: Bluetooth® automatic time correction :contentReference[oaicite:7]{index=7}
• Power supply: Tough Solar rechargeable system :contentReference[oaicite:8]{index=8}
• Glass: Mineral glass
• Compatible band size: 145–215 mm :contentReference[oaicite:9]{index=9}
• Other: Neobrite :contentReference[oaicite:10]{index=10}
• Country of origin: China :contentReference[oaicite:11]{index=11}

Smartphone Link & App Features

• Bluetooth® Mobile Link with CASIO WATCHES app
• Auto time adjustment
• Easy watch setting
• Approximately 300 world time cities
• Time & place tracking
• Reminder function
• Phone finder

Watch Features

• World time: 38 time zones (38 cities + UTC), auto DST switching, home/world city swapping :contentReference[oaicite:12]{index=12}
• Stopwatch: 1/100-second; elapsed, lap and split time measurement :contentReference[oaicite:13]{index=13}
• Timer: Countdown timer; measuring unit 1 second; range 60 minutes :contentReference[oaicite:14]{index=14}
• Alarm/hourly time signal: 5 daily alarms; hourly time signal :contentReference[oaicite:15]{index=15}
• Light: Double LED light (Super Illuminator) with selectable duration and afterglow :contentReference[oaicite:16]{index=16}
• Light colour: LED: White :contentReference[oaicite:17]{index=17}
• Calendar: Full auto-calendar (to year 2099) :contentReference[oaicite:18]{index=18}
• Energy saving: Power Saving mode :contentReference[oaicite:19]{index=19}
• Battery display: Battery level indicator :contentReference[oaicite:20]{index=20}
• Run time: Approx. 7 months (normal use) / 18 months (power saving) after full charge :contentReference[oaicite:21]{index=21}
• Accuracy: ±15 seconds per month (without mobile link) :contentReference[oaicite:22]{index=22}
• Other features: Hand shift; 12/24-hour format; day display selectable in six languages :contentReference[oaicite:23]{index=23}
• Regular timekeeping: Analogue and digital display with dual-layer layout :contentReference[oaicite:24]{index=24}

Authorised Casio Retailer

TacTree is an authorised Casio UK retailer. All Casio watches supplied are 100% genuine, brand new and sourced through approved UK distribution channels. Orders are supplied with official Casio packaging and manufacturer documentation for complete authenticity and peace of mind.

Delivery:

Free Tracked Delivery on orders over £30
Free Express Delivery on orders over £150
Collect in store - Free
Northern Ireland or Highlands & Islands available from £3.95

For full information refer to our Delivery Information page

Returns:

Please use our Returns Portal to request your return and choose your method of resolution.

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