A workspace security system having processors, sensors, and actuators for local and remote monitoring, control, and automation of physical and environmental security, safety, efficiency, and productivity. The AV device includes an on screen display processing unit to OSD process information, and a control unit to control the OSD processing unit so that the OSD processing unit OSD processes a plurality of modules constituting the AV device and functions thereof. The VCO is operated in a first frequency band using a first inductance that forms part of a first resonant circuit, and the VCO is switched for operation to a second frequency band by the closing a switch that causes a second resonant circuit to be inductively coupled to the first resonant circuit. Each of the superhard bearing elements includes a bearing surface and a base portion. The reactor tank can be applied to remove suspended solids, BOD, ammonia, nitrate, TKN, phosphorus, pathogens and other pollutants from the wastewater.