My next review will be Oukitel K4000 (black) from Chinese main land. It used magnesium metal alloy for main frame seems like to other Android phones thoes are used same structure. Only difference is this phone not made with duralumin alloy.
K4000 advertised their strong front screen glass. They are using K4000 as a hammer, see below Youtube video.
I hope it is really in life durable smartphone for limited waters and scratch resisted. And a great battery capacty of 4000mAh at low energy costed CPU !