The internal hard drive can be replaced by the user, for example if you wish to upgrade to a larger storage capacity.
Region free devices allow you to play games from different continents. This enables you to collect a larger game library, and you could play games before they are released in your region.
We consider a thinner chassis better because it makes the product more compact and portable. Thinness is a feature highlighted by many manufacturers of mobile devices, but it is essential for a wide range of products.
The width represents the horizontal dimension of the product. We consider a smaller width better because it assures easy maneuverability.
Devices with an internal power supply are desirable as they don't require a large external "power brick" on the cable. It’s more aesthetically pleasing and an advantage if you have limited space.
Volume is the quantity of three-dimensional space enclosed by the product's chassis or, in simpler terms, the space the product occupies.