The difference is that there's a button to release the hinge in the back, so you don't have to pull it out by hand.

ENGADGET

On the other hand, it is by no means certain that Royal would pull out in the event of an adjournment.

BBC: Valentine test for Princess tie-up

By using two air muscles to pull a joint in different directions, the robot hand is capable of strong and precise actions.

ECONOMIST: Mechanical hand seeks dangerous, dirty and dull jobs