Sei que as imagens nao são as melhores :-( mas parecem-me 2 sensores , embora o manual não mostre nenhuma foto.
(http://imageshack.us/a/img707/7193/img20120922125429.jpg) (http://imageshack.us/photo/my-images/707/img20120922125429.jpg/)
(http://imageshack.us/a/img515/9093/img20120922122700.jpg) (http://imageshack.us/photo/my-images/515/img20120922122700.jpg/)