With its rounded corners and aluminum chassis, the HP Elite book 840 is one of the most attractive business laptops. At 21mm thick and with a and with a 1.58Kg weight, the Elite book is both light and easy to carry. elite book 840 have best graphical experience and high range of wifi it’s include, external sim card support and sd card support. I use thise laptop to check it for more then 34 hr continue and it’s good nothing problem at all I have been used this laptop for 2 year, and it’s best for me, no hangging, very fast, at internet suffering then other my friends laptop,