SensorWorx SWX-900-AX Power Pack - Single Relay + 150 mA Supply - Auxiliary Switch Input - 120-277VSensorWorx SWX 900 AX SWX 900 AX Product Description SensorWorx power pack controllers transform incoming line voltage power to Class 2 low voltage as needed by sensors or other control devices. Additionally, they switch on off power to the connected lighting load as directed by the sensors and controls. SensorWorx power packs utilize a powerful microprocessor to optimize its switching timing in order to ensure long relay life even when controlling