Canadarm2 connects with Dextre
Special Purpose Dexterous Manipulator
The Special Purpose Dexterous Manipulator, or "Dextre", is a smaller two-armed robot that can attach to Canadarm2, the ISS, or the Mobile Base System. The arms and their power tools are capable of handling delicate assembly tasks and changing Orbital Replacement Units (ORUs) currently handled by astronauts during spacewalks. Although Canadarm2 can move around the station in an "inchworm motion", it's unable to carry anything with it unless Dextre is attached. Testing was done in the space simulation chambers of the Canadian Space Agency's David Florida Laboratory in Ottawa, Ontario. The manipulator was launched to the station on 11 March 2008 on STS-123.