Switch Hitter Stance????

I was just watching some boxing fights since I am still a relatively new fan to boxing. In doing so I came upon a fighter name junior witter where he had an awkward style. So I checked him out on wiki and on the stance part it said Switch-Hitter. I had heard southpaw and orthodox and I myself when I box am a orthodox. But how does this switch-hitter work what are the patterns behind it and what makes it effective and what kind boxer should use it ( size wise or if the guys got a good jab in that aspect)