is also the only robotic arm on the station to not include controllers, but instead controlled through several different interfaces. While possessing multiple control modes, it is primarily used in autotrajecotry mode, but manually selectable single-joint modes are also available. In addition to being able to be controlled from the station, ground operators can control the arm, as well. EVA control Control from outside the space station uses a specially designed interface that can be controlled while in a spacesuit known as the Extra Vehicular Activity-Man Machine Interface (EVA-MMI or EMMI). The EVA-MII has 16 LED displays of eight characters, each; displaying essential status data, command verification data and emergency caution and warning messages. It also provides redundancy for critical status data through redundant LEDs. The EVA-MMI allows for manual control of the arm in emergencies during an EVA. During manual control, only one degree of freedom at a time in a joint space, or one degree of freedom in Cartesian Space is able to be used. Also on the console is the emergency stop button which, when pressed, will activate brakes in all joints and at the same time sent a command to the Russian Segment to switch the whole arm off. When ever the ERA is active, there will always be two astronauts with an EVA-MMI, at two different locations. One has full control of the arm, while the other can at times issue an emergency stop command, as well as take over control of the arm. In total the EVA-MMI can survive long periods of space exposure, totaling up to 18 months. Onboard control Control from inside the space station is done by the Intra Vehicular Activity-Man Machine Interface (IVA-MMI), using a laptop, which shows a computer generated model of the ERA and its surroundings. As well on several monitors, video feeds from the arm are also available. In comparison to the EVA-MMI, the IVA-MMI provides more data from the arm, including the intended position of the arm. The IVA-MMI is used during servicing missions. The control systems finished development in 2001. Capabilities The ERA has the ability to operate under manual control, as well as automatically or semi-automatically. The autonomy of the arm allows for astronauts to focus on other tasks, due to being freed up from others that the ERA can cover. Specific tasks of the ERA include: Installation, removal or replacement of experiment payloads