I’ll see your arm and raise you an arm and two legs. It was the battle of the bots on the CES show floor as robot vacuum manufacturers Dreame and Roborock each added limbs to their rival robovacs.

The Roomba competitor showcases what the company believes will be the next big step in robovac evolution: an arm. The idea of mounting a manipulator is no doubt as old as robot vacuums themselves.

The arm is designed to assist people with disabilities. WORCESTER — When someone envisions a robotic arm, they probably are thinking of a large, heavyweight tool used to assemble Ford pickups in ...