What are DND mode, Smart DND mode and Timed DND?

Turn on DND: once turned on, the watch will no longer vibrate when notifications and incoming calls are received in your mobile phone. Tap again will disable DND mode.

Timed DND: You can customize the time period when DND mode is automatically turned on or off.

Smart DND: After you fall asleep with wearing the watch, the watch will automatically turn on DND mode.