The Black Button is a physical button on the right-hand side of the watch and serves four functions:
Power on the watch (hold for 5 seconds)
Wake up the watch
Sleep mode (turn off the screen)
Reboot (Press and hold)
The Red Button is a physical button on the left-hand side of the watch and serves two main functions:
Press and hold for five seconds to initiate an SOS Emergency alarm.
“Back” button. Quickly press and release to exit the apps and go back to the main screen.