These subseries come with Bluetooth

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[GSW-H1000]

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G-Shocks with bluetooth can be connected to one of Casios smartphone apps.
Depending on your watch, the app can be used to do things like:
- time syncronisation
- adjust watch setting (eg. time zone, alert, timer, ..)
- syncronise fitness data
- transfer tracks
On some bluetooth models like the GBA-400 you can use your watch, to control the music played on your smartphone.