Casio G-Shock Smart Sync

This app integrates the Casio G-shock square digital Bluetooth watches (B5600, B5000 series), with Google services such as Google Calendar events and Google Alarm Clock. It also works as a remote control for your phone. It is not meant to replace the official Casio app. Instead it converts your traditional G-shock into a semi-smart watch.

These and these watches are supported.