Excerpt: PMPs come in all shapes and sizes, and the T.sonic 820 is testimony to the fact. Screens don't have to be large for a player to play video, but the question is, will the experience still be good enough for you to enjoy? And what about the additional features? Here are the answers to these questions. Form Factor In a rather traditional candy bar design, the T.sonic 820 ooks a bit like a miniature mobile phone that’s missing a few keys.