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CASIO G-SHOCK GBA-900-4AJF GBA-900-4A Mobile link function 20 bar watch

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If you are not happy with your purchase and wish to return an item, please contact us within 7 days from receiving your order.
Please provide your order number as well as the reason for your return. Our customer service team will review the return request and will send further instructions if the return is approved.
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Returned items must be unused, in the same condition that we sent it to you, and in their original packaging. Stains, folded cards, broken seals/ plastic foiling broken will not be accepted. If the condition of the product shipped back to us is not in acceptable condition we reserve the right to not refund or exchange. Products that have been personalized cannot be refunded or exchanged.
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G-Shock is a line of watches manufactured by Japanese electronics company Casio, designed to resist mechanical shock and vibration. G-Shock is an abbreviation for Gravitational Shock. The watches in the G-Shock line are designed primarily for sports, military and outdoors-oriented activities; nearly all G-shocks are digital or a combination of analog and digital and have a stopwatch feature, countdown timer, electroluminescent backlight and 200-metres of water resistance.

Product Description

 G-SHOCK has a strong presence in the street scene by fusing with various cultures around the world. It is a sports line that comfortably supports daily training with the concept of urban sports for athleisure.

In terms of functionality, it can be connected to a smartphone via Bluetooth®. By linking with the GPS function of the smartphone, the distance measurement by the accelerometer is corrected. Once corrected, it will be possible to measure the mileage more accurately with the watch alone from the next time.
By linking this distance measurement and running time measurement, in addition to supporting running pace measurement, it is also equipped with an auto trap function that automatically measures the time each time it runs a certain distance. In addition to the conventional step tracker (step count measurement function), interval timer (up to 5 x 20 sets), lap time measurement (up to 45 x 1 run), and calorie consumption measurement, it supports daily training.
In addition, you can check life logs and activity history in cooperation with a dedicated application that is useful for various clock settings and training management, and a newly developed donut-shaped liquid crystal is used for the display. It displays a 5-step exercise intensity graph that visualizes the intensity of the user's movement and the set goal achievement rate, which helps to motivate daily exercise.
Equipped with a super illuminator, considering visibility in dark places. A soft urethane material is used for the band to improve the fit, and a vent hole is provided at the connection part of the band to improve breathability. In addition, even when using multiple functions such as automatic time adjustment by Bluetooth® connection, simple notification function (only notification sound), and step count function on a daily basis, the battery life is about 2 years. I also learned the performance that is useful for my lifestyle. It is a model that is widely useful as a fashion item, from daily health management to strengthening the endurance of running.
Distance measurement correction function linked with the GPS function of the smartphone
Bluetooth® automatic connection
Running measurement function that can measure mileage, speed, pace, and calories burned
Step tracker that automatically measures the number of steps when walking starts
Multi-timer useful for interval training
Training measurement for up to 45 lap memories x 1 run
Training management function (achievement level, history) by dedicated smartphone app
Auto double LED light (super illuminator) that illuminates the dial and liquid crystal
Soft urethane band with excellent wearability
Large vents in the band connection
Achieves a battery life of about 2 years while using the step count and simple notification function (only notification sound) on a daily basis.

Product specification

  • Case / bezel material: Resin
  • Resin band
  • Impact resistant structure (shock resist)
  • Inorganic glass
  • Water resistant to 20 bar
  • Mobile link function (Automatic Connection, function interlocking with compatible mobile phones via Bluetooth® communication)
  • Dual time (with home time time change function)
  • Airplane mode
  • Life log measurement function (measures calories and distance based on step count measurement by accelerometer) * <Daily data display> including basal metabolism Step count, calories, distance
  • User profile settings
  • Needle evacuation function (If the needle overlaps with the liquid crystal display and is difficult to see, the needle can be temporarily retracted from above the liquid crystal display)
  • Stopwatch (1/100 second (less than 1 hour) / 1 second (1 hour or more), 24-hour counter, with lap / split, distance / pace switching display, automatic / manual lap function, automatic lap notification, measurement data up to 45 This memory (measurement start month / day / hour / minute, total time / distance / average pace / calories burned, lap number, time / distance / average pace for each lap / split)
  • Timer: Timer for interval measurement that can set up to 5 times (set unit: 1 second, maximum set: 60 minutes, measurement in 1 second units, auto repeat, 5 seconds countdown auto start, repeat (up to 1 to 20 times) Can be set) With function)
  • 5 time alarms / time signal
  • Battery charge warning function
  • Power saving function (In a dark place, the display is turned off after a certain period of time and the hand movement is stopped to save power)
  • Fully automatic calendar
  • 12/24 hour system display switching
  • Operation sound ON / OFF switching function
  • Date display (month / day display replacement)
  • Double LED light: LED light for dial (auto light, super illuminator, afterglow function, with afterglow time switching (1.5 seconds / 3 seconds)),
  • LED backlight for LCD (auto light, super illuminator, afterglow function, With afterglow time switching (1.5 seconds / 3 seconds)
  • Battery life: about 2 years
  • * If it is not linked with a smartphone, it will oper
  • Size (H x W x D): 51.3 x 48.9 x 16.6 mm
  • Mass: 61g
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