DND mode is not activated on your device, All miboxer products have DND mode and factory defult for DND mode is ON
How to activate DND mode?
Press “OFF” button 3 times within 3 seconds and press “ON” button 3 times, Activated successfully once led light flashes 4 times quickly.
Warm tips: DND mode can help user to save power if they have power failure problem frequently, checking video