| Reference Ocarat | #109353 |
| Reference | GM-5600U-1ER |
| Brand | Casio G-Shock |
| Product Type | Watch |
| Gender | Men |
| Color | Black Gray |
| Material | Steel Synthetic |
| Material Quality | Resin Stainless Steel |
| Warranty | 2 Years |
| Thickness (in mm) | 12,90 |
| Diameter (in mm) | 43,00 |
| Manufacturing | Japan |
| Warranty Type | International |
| Labels and Certificates | Authorized Retailer |
| Case Shape | Octagonal |
| Case Weight (in g) | 73,00 |
| Watch Case Back | Case back secured by screws |
| Crystal Shape | Flat |
| Glass Quality | Mineral Crystal |
| Buttons | 4 Push Buttons |
| Water Resistance (in ATM) | 20 |
| Movements | Quartz |
| Movement Type | Japanese Movement |
| Movement Brand | Casio |
| Calendar and Time | Dates Days Hours Minutes Month Seconds |
| Chronograph Function | Yes |
| Timekeeping and Measurement | 1/100th of a second chronometer Chronometer Chronometer - 24 hours Countdown |
| Alarm Complications | 24h alarm |
| Alarm-Wake Up | Yes |
| Power Reserve (Maximum Duration) | 5 years with a battery |
| Display Type | Digital |
| Display Specifications | Arabic Numerals Digital LED Night Illumination Super Illuminator |
| Techniques and Mechanics | Multifunctions: see description |
| Bracelet Material | Resin |
| Strap Color | Black |
| Water Resistant | Yes |
| Watch Clasp | Tang Buckle |
| Lug Width (in mm) | Special - Custom Made |
| Activities | Swimming / Diving Yachting / Sailing |
| Collection | G-Shock Baby-G and G-Classique |
| Connectivity and Display | Backlight |
Discover the world of iconic Japanese brand Casio, globally recognized for its pioneering scientific calculators. Founded in 1946 by the Kashio brothers, the brand expanded its expertise into watchmaking. Through its G-Shock collection, Casio now presents this Watch GM-5600U-1ER - a bold fusion of sport and style. It features an octagonal case in gray, finished in a combination of polished and satin stainless steel and resin for outstanding durability. Weighing 73 grams, with a 43 mm diameter and 12.90 mm thickness, it is topped by a flat hardened mineral crystal that shields the dial from scratches. 4 silver-toned pushers are distributed on either side of the case for easy access to the watch's many functions. A screw-down case back ensures 20 ATM water resistance.
The dial of this watch features a minimalist design. The rectangular digital display is framed by a dark octagonal surround bearing the pusher labels and the brand name. With its digital readout, the dial is packed with indicators that illuminate in the dark for easy reading - powered by the Super Illuminator function and LED backlighting.
Super Illuminator
With a single button press, the dial lights up in vibrant, on-trend colors.
Shock Resistance
The shock-resistant structure protects the watch against impacts and vibrations.
LED Indicator (flashing)
An LED flashes as soon as the programmed alarm, countdown, or hourly signal is triggered.
Stopwatch 1/100 sec - 24 hours
Measures elapsed time to 1/100th of a second for up to 24 hours. An audible beep confirms the start and stop of the stopwatch.
Countdown Timers - 1/1 sec - 24 hours (with auto-repeat)
Built for those who demand precision: countdown timers alert you to important or recurring events with an audible signal at the preset date and time - then automatically reset and count down again from the programmed duration. Set in seconds, up to 24 hours in advance - ideal for daily medication reminders or recurring training sessions.
Multiple alarms, hourly time signal
Set a daily alarm (time only) or a one-time alarm for a specific date and time (month, day, and hour). The number shown indicates how many independent alarms are available. When the hourly time signal is enabled, the watch beeps at every hour change.
Auto Calendar
Once set, the auto-calendar always displays the correct date.
12/24-Hour Time Format
Display time in 12-hour or 24-hour format
This watch is powered by a Japanese-made quartz movement developed by the brand itself. Its battery delivers up to 5 years of life, keeping all digital functions running smoothly.
The strap is crafted from resin - flexible yet durable, it ensures a comfortable and stylish fit. Secured with an ardillon buckle, its black color complements the overall look of the watch perfectly.
With 200-meter water resistance - or 20 ATM in watchmaker's terms - this watch is built for shallow-water activities. It can handle showers, baths, and casual swimming in the sea or pool (non-professional, breath-hold diving included). For professional scuba diving with tanks, our Ocarat watch team has hand-picked 30 ATM models available in our catalog. One final reminder: never operate the pushers or crown while in contact with water!



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Watch GM-5600U-1ER
(Ref. 109353)