nCase Flip Cover for Mi 4  (Black)

This seems to be good in quality. But the flip which covers the screen has an opening for the ear piece which is not in line with the actual ear piece. So you cannot have a call or listen properly with the flip closed. Better not to buy this. Waste of Money. You can do nothing of this defect, so if you buy, you'll have to throw it away.

Not perfect speaker hole cutting.

This flip cover is very durable but it was not crafted as per the design of mi 4 mobile. Reason is that it does not having proper cut for ear speaker spot. When you are on a call and the flip cover is covering the display, you may not hear the sound properly. Due to the improper cut. The chut is little higher than where it should be. So it blocks the sound coming through the upper Mic.