---
product_id: 151104217
title: "G-Shock GA-2100-1A1ER Analogue-Digital Quartz Watch with Black Resin Case, Silicone Strap, 200 Metre Water Resistance, Stopwatch World Time Timer, 45.40 mm"
brand: "casio"
price: "$219.55"
currency: USD
in_stock: true
reviews_count: 13
category: "Casio"
url: https://www.desertcart.us/products/151104217-g-shock-ga-2100-1a1er-analogue-digital-quartz-watch-black
store_origin: US
region: United States of America
---

# 200m water resistance Durable black resin & silicone Stopwatch & timer precision G-Shock GA-2100-1A1ER Analogue-Digital Quartz Watch with Black Resin Case, Silicone Strap, 200 Metre Water Resistance, Stopwatch World Time Timer, 45.40 mm

**Brand:** casio
**Price:** $219.55
**Availability:** ✅ In Stock

## Summary

> 🖤 Timeless toughness meets sleek tech — own the moment, everywhere.

## Quick Answers

- **What is this?** G-Shock GA-2100-1A1ER Analogue-Digital Quartz Watch with Black Resin Case, Silicone Strap, 200 Metre Water Resistance, Stopwatch World Time Timer, 45.40 mm by casio
- **How much does it cost?** $219.55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/151104217-g-shock-ga-2100-1a1er-analogue-digital-quartz-watch-black)

## Best For

- casio enthusiasts

## Why This Product

- Trusted casio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Day Visibility:** Integrated light feature ensures you never miss a beat, day or night.
- • **Dual Display Mastery:** Seamlessly blends analogue elegance with digital functionality for the modern professional.
- • **Dive-Ready Durability:** 200 metres water resistance means no limits—swim, run, or hike with confidence.
- • **Lightweight Powerhouse:** At just 150g, it’s built for all-day comfort without compromising ruggedness.
- • **Global Time, Local Style:** World time feature keeps you connected across time zones with sleek black-on-black design.

## Overview

The Casio G-Shock GA-2100-1A1ER is a unisex analogue-digital quartz watch featuring a robust 45.40 mm black resin case and silicone strap. Engineered for active professionals, it offers 200 metres of water resistance, stopwatch, timer, alarm, and world time functions, all powered by a reliable lithium manganese dioxide battery. Lightweight yet impact-resistant, this watch balances sporty durability with sophisticated style, perfect for everything from boardroom meetings to outdoor adventures.

## Description

Casio presents the G-Shock GA-2100-1A1ER, an analogue-digital quartz watch designed for men seeking reliable timekeeping with sports functionality. This unisex timepiece features a 45.40 mm black resin case paired with a black silicone strap, creating a cohesive design suitable for casual, formal, hiking, running, swimming activities. The watch combines traditional analogue hands with digital display elements, providing multiple timing functions in one device weighing 150 grams. The GA-2100-1A1ER operates on quartz movement powered by lithium manganese dioxide battery. The watch offers 200 metre water resistance, making it suitable for swimming water sports. Functional features include stopwatch capability, world time display, timer alarm functions with light feature for daytime nighttime commuting use. The resin case material with silicone strap provides impact resistance whilst maintaining durability. Model number GA-2100-1A1ER, part number GA-2100-1A1DR, series 2100. This G-Shock model is part of Casio's sports-themed collection, designed for fitness, running other active uses. The watch serves casual wear, formal wear, hiking, running, swimming purposes for adult men. The black colour scheme 45.40 mm case diameter provide clear visibility of both analogue digital displays. The battery powered design ensures consistent performance across various activities from commuting to sports.

Review: Quick delivery arrived on a Thursday was expected for Monday - Item was perfect
Review: Nothing to complain about - Great value for money, was a gift and my partner loved it

## Features

- Materials: Black resin case with silicone strap construction, 45.40 mm case diameter, quartz movement type, lithium manganese dioxide battery powered, 150 grams
- Design Features: Analogue-digital display combining traditional watch face with digital functions, black colour scheme, unisex design suitable for men
- Functionality: Stopwatch, world time, timer, alarm functions with light feature for daytime nighttime use, waterproof to 200 metres depth for swimming running
- Specifications: Model number GA-2100-1A1ER, part number GA-2100-1A1DR, series 2100, 200 metre water resistance level, battery powered quartz movement
- Care Instructions: Suitable for casual wear, formal wear, hiking, running, swimming, fitness activities, part of the G-Shock sports collection series

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07WGJ1JNW |
| Age Range Description | Adult |
| Band Colour | Black |
| Band Length | 22 Centimetres |
| Band Material Type | Resin |
| Band Width | 25 Millimetres |
| Bands | 1 |
| Best Sellers Rank | 112,489 in Fashion ( See Top 100 in Fashion ) 632 in Men's Wrist Watches |
| Bezel Color | Black |
| Brand Name | Casio |
| Case Diameter | 42 Millimetres |
| Case Material Type | Resin |
| Case Thickness | 11.8 Millimetres |
| Character | No aplica |
| Clasp Type | Buckle |
| Closure Type | Buckle |
| Crystal | Mineral |
| Customer Reviews | 4.6 out of 5 stars 3,366 Reviews |
| Dial Color | black |
| Display | Analog-Digital |
| Embellishment Feature | Crystal |
| Face Style | Crosshair |
| Global Trade Identification Number | 04549526241659 |
| Included Components | 1 package |
| Item Shape | Round |
| Item Type Name | Watch |
| Item Weight | 30 Grams |
| Manufacturer | Casio |
| Manufacturer Part Number | GA-2100-1A1ER |
| Material | Plastic |
| Model Name | GA-2100-1A1ER |
| Model Number | GA-2100-1A1DR |
| Model Series | 2100 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Pattern | Solid |
| Power Source | Battery Powered |
| Series Number | 2100 |
| Special Features | Alarm, Light, Stop Watch, Timer, World Time |
| Sport Type | Climbing, Running/jogging |
| Strap Type | Silicone Strap |
| Style Name | GA-2100-1A1ER |
| Theme | Sports |
| Unit Count | 1.00 count |
| Warranty Type | Manufacturer |
| Watch Movement Type | Quartz |
| Water Resistance Depth | 200 Metres |
| Water Resistance Level | Waterproof |

## Images

![G-Shock GA-2100-1A1ER Analogue-Digital Quartz Watch with Black Resin Case, Silicone Strap, 200 Metre Water Resistance, Stopwatch World Time Timer, 45.40 mm - Image 1](https://m.media-amazon.com/images/I/61g6yHKxg0L.jpg)

## Questions & Answers

**Q: How many alarms has the watch?**
A: I think 5 but not 100%

**Q: Are these genuine? I had  replica sent to me before (different company). Apparently they're rife.**
A: the ones we sell are 100 percent  genuine

**Q: Does this watch change time automatically when clocks go back/forward.**
A: No, you have to change it manually. It’s fairly straightforward to do.

**Q: Does it comes with international warranty card? How long is the warranty? Thanks**
A: Yes

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quick delivery arrived on a Thursday was expected for Monday
*by H***N on 6 August 2026*

Item was perfect

### ⭐⭐⭐⭐⭐ Nothing to complain about
*by A***R on 24 May 2026*

Great value for money, was a gift and my partner loved it

### ⭐⭐⭐⭐⭐ My go to daily watch
*by J***E on 15 June 2026*

Great watch

## Frequently Bought Together

- Casio Gents 45.40mm Quartz Watch with Black Analogue - Digital dial and Black Plastic/Resin Strap Strap GA-2100-1A1ER
- Casio GA-2100-1AER G-Shock Carbon Core Octagon Series Watch -Black
- Casio Ga-2100-1a4er Watch One Size

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-09-25*