What is it about?
App Store Description
This is the basic app for connecting and communicating with a Bluetooth(R) v4.0 enabled G-SHOCK.
Pairing your watch with an iPhone enables use of a variety of different Mobile Link functions that greatly enhance the iPhone experience. The G-SHOCK+ app also simplifies certain watch operations by letting you perform them on your phone screen.
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iPhone 6s, iPhone 6s Plus (iOS 9.0 to 9.3)
iPhone 6, iPhone 6 Plus (iOS 8.1.3 to 9.3)
iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s (iOS 8 to 9.3)
Supported G-SHOCK Models:
GB-6900AA/AB, GB-5600AA/AB, GB-6900B, GB-X6900B, GB-5600B, GBA-400
Use the newest OS version.
Continued use of GPS running in the background can dramatically decrease battery life.