What the difference between Adjustable bed and Sofa Adjustable Bed?

Adjustable bed has two meters long which is too long to fit the sofa in the living room because it will take too much space. But sofa adjustable bed is shorter in close and longer in open, this can match the sofa styles.

Also Adjustable beds are put in the bedrooms and run in the night. But sofa adjustable bed is in the living room and run regularly in the day time,therefore it has to be less pinch points to protect the kids for safety.

Below is the linkage of Linkrest Sofa Adjustable Bed Mechanism:

The Video of Sofa Adjustable Bed