QSN-2ECO-120-D: 2-loop ESN for control of EcoSystem-compatible ballasts, drivers and fixtures Features • Provides EcoSystem loop power for two loops of EcoSystem ballasts or drivers (up to 250 mA per loop). • Power failure memory retains control unit programming in the event of a power loss. • Includes QS Link for connection to an Athena system. • Energi Savr Node EcoSystem Power Module can be used in an Athena system to control and manage light in an entire building.