The present invention includes polymerization catalyst activator complexes which include at least Group 13 metals. Additional apparatus, systems, and methods are disclosed. In addition, a characteristic parameter, such as a characteristic distance or characteristic density, may be determined. According to the invention, this is achieved by the fact that the interface of the adjusting unit is designed as a wave receiver for receiving waves as wireless setting information of the operating parameters. An adjustable linkage is employed to alter the ratio of the mass flow rates of the two fluids. Generating an explanation of benefits after the payment is scheduled.