What is ergonomics? Ergonomcs is defined as the science that deals with designing and arranging things so that people can use them easily and safely.
How the product is held by our hands, how it feels on our fingers, how it nestles to our ear.
On average people check their handheld devices 150 times a day. How do they fit in out pocket, bag, purse etc?
What materials is the device produced out of, how can these materials effect you.