The watch emits radio signals while Bluetooth is enabled. If you want to stop the emission of radio signals (because you are in a hospital, an aircraft, or somewhere else radio signals are controlled), you can manually disable Bluetooth.

To disable the watch's Bluetooth manually

1.

Check to confirm that the Bluetooth icon is on the watch display.

2.

In the Timekeeping Mode, hold down the B button for about two seconds until the Bluetooth icon disappears from the display.

Disconnecting

Disconnected

To re-connect after disabling the watch's Bluetooth manually

Perform the procedures under "To re-connect manually to the last-connected phone".