This mobile application is a guide that gives information about Fitbit charge 4. From this app, you can learn about device settings and usage, fitbit versa synchronization, band changing and wearing, fitbit charge 4 setup, how to charge the device, notification configuration, navigating, alarm setup and fitbit charge 4 watch face change. You can learn all the information that will help Fitbit charge 4 smartwatch users by downloading our application. Note: This mobile application is a guide. It is not an official app or part of an official app product. Download this guide to learn about Fitbit charge 4.