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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteCasio America announced the GMAS2100PR, sold under the full U.S. product name GMAS2100PR-4A, at $110 with availability beginning October 1, 2026. The pastel-pink analog-digital watch’s standout detail is a pink ribbon-shaped hand on the inset dial at 9 o’clock. Casio says it will donate $25,000 to the Breast Cancer Research Foundation (BCRF), regardless of sales.
Model name, price and US availability
Casio America’s September 30, 2026 announcement calls the watch GMAS2100PR. Casio’s U.S. product listing gives the full model number as GMAS2100PR-4A. Casio announced a U.S. price of $110 and availability beginning October 1, 2026, through select retailers, G-SHOCK’s U.S. website and the G-SHOCK Soho Store. Retailer stock can change, so check current availability before buying.
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What makes this Pink Ribbon edition distinctive?
The watch pairs a soft pink resin case and band with vivid magenta accents on the hands, indices and case markings. Its most specific campaign detail is the pink ribbon motif incorporated into the hand on the inset dial at 9 o’clock. Casio also created special packaging for the 2026 initiative.
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Casio America describes this as its fourth annual Pink Ribbon special edition. The design is based on the compact 2100-series analog-digital format rather than a digital-only display.
#1 Best Overall
- It is slim, lightweight, and compact in design and boasts a chic, monochromatic look
- Shock Resistant
- Carbon Core Guard structure
- Double LED light: LED light for the face & LED backlight for the digital display
Size, construction and water resistance
| Specification | GMAS2100PR-4A |
|---|---|
| Dimensions | 46.2 × 42.9 × 11.2 mm |
| Weight | 41 g |
| Construction | Carbon Core Guard; carbon/bio-based resin case and bezel; bio-based resin band |
| Crystal | Mineral glass |
| Water resistance | 200 meters |
These specifications make it a relatively compact analog-digital G-SHOCK in the 2100 family, while the 200-meter rating is a water-resistance specification—not a statement that every activity at that depth is suitable. Casio lists two SR726W batteries and approximately three years of battery life; actual life can vary with use.
Functions beyond the display
- World time: 31 time zones, covering 48 cities plus UTC.
- Timing: a 1/100-second stopwatch and countdown timer.
- Daily reminders: five daily alarms.
- Readability and display options: LED lighting, hand shift, and 12- or 24-hour time format.
How the BCRF donation works
Casio says it will donate $25,000 to BCRF regardless of sales. The contribution is not described as being triggered or increased by an individual purchase. In its September 30, 2026 release, Casio also said BCRF supports more than 260 investigators across 17 countries and invested $75.75 million in scientific grants “this year.” The same release attributed a 44 percent decline in breast cancer deaths since BCRF’s 1993 founding to research; that figure is Casio’s claim, not an independently verified statistic here.
Rank #2
- Magnetic resistant, shock resistant, 200-meter water resistance, led light, world time, stopwatch, countdown timer
- 5 daily alarms, hourly time signal, full auto-calendar, 12/24-hour format, approx. Battery life: 3 years on cr1220
- Quartz Movement
- Case Diameter: 49mm
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
Shermeen Greenmun, Casio’s vice president of Timepiece, framed the campaign as support for sustained breast cancer research. Her remarks and the donation description are Casio’s statements about its campaign.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesWho should consider it?
The GMAS2100PR-4A is a natural fit for someone who wants a pink analog-digital G-SHOCK and values the ribbon detail and campaign association. When comparing it with other 2100-series or Pink Ribbon editions, check case dimensions and wrist fit, analog-digital versus digital-only display, functions, battery life, price and local stock. Casio’s campaign page lists earlier campaign-linked models, including DW5600PK, GMDS5610PK, GA-2100P, GMAS2100P and GMAS145PK; current prices and availability for those models are not established here.
Quick Recap
Best Value
- Case size (L× W× H): 42.8 × 39 × 14.7 mm
- Case and bezel material: Resin
- Construction: Shock Resistant
- Power supply and battery life: Approx. battery life: 3 years on CR1616
- Weight: 34 g
Rank #4
- Casio G-Shock Alarm World Time Quartz Analog-Digital Ladies Watch GMA-P2100ST-4ADR
Rank #3
- Boasting the classic G-Shock look with an urban upgrade, this women's watch features a black analog digital dial with pink, teal, purple, and lime colored accents for a multi-dimensional, high impact feel
- With the iconic Casio watch shock resistant construction and magnetic resistance, this G-Shock is in a class of its own
- Official Licensed Product
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
