TickTock - a really weird phone (clock) thing
There are diverse smart features integrated into the 1.3" sub-screen, with which you can answer incoming calls, check notifications and messages, listen to music, take a selfie with the primary camera, etc. quickly and easily... More here.
The physical implementation of the sub-screen is one of the strangest things I have seen on a new phone. It makes no sense at all to me.