Casio Bluetooth watch app.
This is the basic application for connecting and communicating with a Bluetooth(R) v4.0 enabled G-SHOCK.
Pairing the watch with your smartphone enables use of a variety of different Mobile Link functions that greatly enhance the smartphone experience. The G-SHOCK MOVE app also simplifies certain watch operations by letting you perform them on your phone screen.
Visit the website below for details.
http://world.g-shock.com/
Application privacy policy
https://web.casio.jp/gshockmove/en/privacy/notice/