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Flight mode is on. Flight mode cuts off all wireless communication from your watch. You can still use it, but you can't sync your data with the Polar Flow mobile app or use it with any wireless accessories.

Do not disturb mode is on. When do not disturb is switched on, you will not get any notifications or call alerts. Also, the backlight activation gesture is disabled.

Vibrating alarm is set. To set the alarm, go to Settings > Watch settings.

Your paired phone is disconnected and you have notifications turned on. Check that your phone is within Bluetooth range from your watch and Bluetooth is enabled on your phone.

Screen lock is on. Press the button for 2 seconds to unlock the screen.