For an effective product design, the needs from customer, marketing, product
outlook, engineering and production should all be considered. It need turns
product concept to product performance spec to product design spec to manufacturing
For product form factor, generally US area requires larger buttons, ergonomic
and more roundness in body shape, less bright and less sharp in color tone.
While EU market look for trendy and pleasant looking design, higher contrast
color tone, thinner body shape.