299.00 GBP
Casio G-Shock Gravitymaster Bluetooth Watch GR-B100-1A3ER
Casio (4549526193521 / GR-B100-1A3ER) - Alarms and timers: 5 Multi Alarm, Hourly Time SignalCountdown Timer - Water resistant: 20 Bar (Dive) - Year: 2018 Spring and Summer Collection - GR-B100-1A3 - Closed With Screws
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Casio G-Shock Gravitymaster Bluetooth Watch GR-B100-1A3ER
The GR‑B100‑1A3ER is a flagship model from Casio’s renowned G‑Shock line, blending rugged durability with cutting‑edge smart features. Designed for the modern adventurer, this watch delivers reliable timekeeping, advanced connectivity, and an unmistakable aesthetic that stands out in any setting.
Design & Build
The case is a 53.8 mm round plastic/resin shell, finished in deep black to emphasize its bold silhouette. At 17.3 mm thick, the watch offers substantial presence while maintaining a comfortable wrist fit. The back of the case is secured with screws and crafted from steel silver, providing structural integrity without compromising style.
The strap is a 27.6‑mm wide black plastic/resin band that measures 150–220 mm in length, allowing for easy adjustment across most wrist sizes. A sturdy buckle clasp ensures the watch stays securely fastened during high‑impact activities.
Display & Timekeeping
The GR‑B100‑1A3ER features a hybrid analog‑digital display: traditional analogue hands for hours, minutes, and seconds, complemented by a digital readout that can toggle between 12‑hour or 24‑hour notation. The dial is illuminated automatically with an LED backlight, ensuring visibility in low‑light conditions.
The watch’s movement is Casio’s solar quartz engine (CTL1616), which harnesses ambient light to recharge its internal battery. This technology guarantees long‑term reliability and eliminates the need for frequent battery changes.
Chronograph & Timer Functions
Equipped with a full chronograph system, the watch offers:
- Stopwatch capability up to 1/1000 second precision.
- A 24‑hour timer for extended timing tasks.
- An auto‑repeat countdown timer that can be set to repeat automatically.
Alarm & Notification System
The GR‑B100‑1A3ER supports a comprehensive alarm suite:
- Hourly time signal sound alarms.
- A single daily alarm and a date alarm for calendar reminders.
- Monthly alarm functionality for recurring events.
- Battery level indicator alerts to keep you informed of power status.
Smart Connectivity & Smartphone Integration
Bluetooth connectivity transforms this rugged timepiece into a versatile smartwatch. When paired with a compatible smartphone, users gain access to:
- Over 300 world time cities for global travelers.
- Customizable alarms and timers directly from the phone.
- Hand‑alignment correction to maintain accurate timekeeping.
- Home city time swapping for seamless transitions between time zones.
- A phone finder feature that helps locate a misplaced device.
The watch’s automatic time adjustment (12/24‑hour) and DST-setting ensure it remains accurate across daylight saving changes without manual intervention.
Water Resistance & Durability
With a water resistance rating of 20 bar (200 m dive), the GR‑B100‑1A3ER is suitable for professional diving, swimming, and other aquatic activities. Its robust construction resists shocks, vibrations, and harsh environmental conditions—hallmarks of the G‑Shock brand.
Calendar & Date Functions
The watch features a full auto calendar, displaying day, date, month, and year in an intuitive format. This eliminates the need for manual adjustments, ensuring you always have accurate date information at a glance.
Crystal & Protection
A mineral crystal protects the dial from scratches and impacts while maintaining optical clarity. Combined with the watch’s overall rugged design, this ensures longevity even under extreme conditions.
Overall Performance & User Experience
The Casio G‑Shock Gravitymaster Bluetooth GR‑B100‑1A3ER delivers a seamless blend of traditional watchmaking and modern smart technology. Its solar quartz movement guarantees dependable power, while the comprehensive alarm system and Bluetooth features provide versatility for everyday use and specialized tasks alike.
Whether you’re navigating deep waters, tackling high‑impact sports, or simply keeping track of time across multiple zones, this watch stands as a reliable companion that merges durability with sophistication.
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Category
This product is cataloged in our store in these categories
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- Wrist Watches |
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International
Find this product in one of our international stores
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 269.10 EUR  |
| Colors
Predominant colors of the product |
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| Identifiers | |
| Brand |  Casio is a Japanese electronics company that produces a wide range of electronics products, including watches, calculators, and digital cameras. The company was founded in 1946, and has become a well-known and trusted brand in electronics products. |
| MPN | Casio GR-B100-1A3ER |
| ID | 8575508 |
| Dimensions / Weight | |
| Key Features | |
| Alarms and timers | 5 Multi Alarm, Hourly Time SignalCountdown Timer |
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Alternative nr A unique identifier that distinguishes a product variant from its base model. It is used to track different configurations, colors, sizes or special editions of the same product line.
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GR-B100-1A3 |
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Back case The design or construction method of a product’s back cover, such as whether it is screwed, snap‑on, has a battery hatch, or is see‑through. This attribute helps users understand how the back panel can be opened, closed, or accessed for maintenance or battery replacement.
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Closed With Screws |
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Back case material The material used to construct the back or rear shell of a product, such as metal, plastic, resin, or composite blends. This attribute helps users understand durability, weight, appearance, and suitability for specific applications.
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Steel silver |
| Band length | 150 - 220 mm |
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Band width The linear measurement of a product’s band width, expressed in a unit such as millimetres or inches. It indicates the horizontal dimension of the band and is used for sizing, fitting, and compatibility purposes.
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27.6 mm |
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Battery The specific type or model of battery used in a product, such as brand, part number, chemistry, or cell configuration.
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CTL1616 |
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Calendar The format or style of the calendar displayed by the product, such as "Date – Window", "Date – Digital", "Date – Dial" or other descriptive variants. It indicates how dates and time information are presented to the user on the device’s display or app.
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Full Auto Calendar |
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Calendar type The format or style of a calendar displayed by the product, such as day‑date, month‑year, or automatic world time. It indicates how dates and times are presented to the user.
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Day - Date - Month - Year |
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Case colour The colour or combination of colours that a product’s outer shell or enclosure is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the case for consumers.
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Black |
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Case material The type of material used to construct the outer shell or enclosure of a watch, such as metal (steel, titanium), plastic, resin, ceramic, or composite blends. This attribute helps users understand durability, weight, appearance, and suitability for specific applications.
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Plastic / Resin |
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Case shape The geometric shape of the product’s outer shell or enclosure, such as round, rectangular, square, oval, or other common silhouettes. This attribute helps users quickly identify and compare items based on their overall appearance.
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Round |
| Case thickness | 17.3 mm |
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Chronograph and timers A list of the time intervals that a product can measure or count down, such as "60 minutes", "1/100 seconds 24 hours" or "30 minutes – 24 hours". These values describe the supported timer modes and their maximum durations.
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Stopwatch /Chronograph - 1/1000 - 24 HRTimer(s) - Countdown timer with auto repeat function |
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Clasp type The type of clasp or closure mechanism used on a product, such as buckle, deployment clasp, folding clasp, or hidden clasp. It indicates how the item is fastened and can affect comfort, security, and style.
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Buckle |
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Connectivity Indicates the types of network or data interfaces available on a product, such as wired (e.g., Ethernet, USB) and wireless (e.g., Wi‑Fi, Bluetooth). The value may list one or more interface names separated by commas.
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Bluetooth |
| Crown | Push Crown |
| Crystal | Mineral |
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Diameter The linear measurement across a circular or round object, taken through its center. It is expressed in units of length such as millimeters, centimeters, inches, or feet and represents the widest span of the item.
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53.8 mm |
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Display type The type of visual panel or display technology used in a product, such as LCD, LED, OLED, TFT, IPS, AMOLED, or analog. It indicates the underlying technology that determines image quality, color reproduction, power consumption and suitability for different use cases.
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Analog - Digital |
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Lighting The type of illumination used by the product, such as LED, backlight, or RGB lighting. This attribute indicates whether the device uses a single light source, multiple sources, or special lighting modes.
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AUTO LED |
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Mechanism The type of mechanical or electronic system that drives a product’s timekeeping or motion function, such as quartz, automatic, manual, digital, or hybrid. It indicates whether the movement is powered by a battery, mainspring, or other energy source and helps users compare performance, maintenance needs, and typical accuracy.
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Solar Quartz |
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Movement The classification of the mechanical or electronic system that drives a product’s timekeeping or motion function, such as quartz, automatic, manual, digital, or hybrid. It indicates whether the movement is powered by a battery, mainspring, or other energy source and helps users compare performance, maintenance needs, and typical accuracy.
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Automatic Time Adjustment12/24-hour Timekeeping |
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Movement brand The company that designs, produces, or supplies the mechanical or electronic movement used in a watch or similar timekeeping device. This value identifies the manufacturer of the internal mechanism, allowing users to assess quality, compatibility, and support options.
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Casio |
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Movement Type The mechanism that drives the watch’s timekeeping, such as quartz, automatic, solar, or digital. It indicates whether the movement is powered by a battery, mainspring, or energy‑harvesting technology and helps buyers compare performance, maintenance needs, and typical accuracy.
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Solar |
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Original strap The materials that make up a watch or bracelet strap, such as leather, metal, silicone, textile or composite blends. Multiple materials may be listed when a strap is composed of more than one component.
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G-Shock Strap 10569595 |
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Water resistant The maximum pressure that a product can withstand without leaking or damage, expressed in bars or atmospheres. It indicates how well the item resists water penetration during use.
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20 Bar (Dive) |
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Year The calendar year in which a product collection was first released to the market. It is expressed as a four‑digit number (e.g., 2019) and can be used to filter, sort, or compare products by their release period.
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2018 Spring and Summer Collection |
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