Length. Power. Pressure. integer, 0-100. Three potential values: On, Off, Unknown Onlevel also includes On/off this way, we do not have to have multiple instantiations of the same class Defines abstract device functionalities All other device profiles shall inherit from Interface *note: functionalities and not properties This indicates the percent open, i.e., 0 = "Fully Closed" 100 = "Fully Open"