The BZ-50 universal voltage power pack provides 24 VDC operating voltage to Wattstopper's low-voltage occupancy sensors. This device is constructed with environmentally friendly materials. Self-contained power supply relay system Efficient switching power supply providing optimized current output-based on number of sensors LED indicates status of relay or if there is a low-voltage overcurrent The product meets the materials restrictions of RoHS Zero crossing circuitry for reliability and increased product life