The Chinese manufacturer ViewSonic, hitherto best known to market TV and computer monitors, has launched the A8 Plus, a new rugged smartphone between the entry and midrange.  Cured smartphones are perhaps not the best sellers in the market, but they are highly valued by professionals working outdoors and extreme sports enthusiasts.  Some manufacturers such as MTT, CAT or Crosscall are also specialized in this niche by offering rugged and waterproof terminals. ViewSonic, known previously to market TV and LED monitors, also seems to want to rush in this niche market by launching its new A8