There are so many car stereo head units on the market. How do you know
what to choose? Let's take a look at some of the things you should
look for when buying a head unit.
1. How user friendly is the head unit?
Your head unit must be user friendly. This is the part of your car
stereo you will interact with the most so you must feel comfortable
using it. Before buying one be sure to play around with it and see how
easy and quick it is to change tracks on a CD, switch radio stations,
and so on. Are the buttons too small? You need to be able to enjoy
using your head unit.
read here
http://www.zone-car.com/?things-to-l...-head-unit.php