B&K Precision 1513 Power Supply/Battery Eliminator, 3.3, 4.5, 6, 7.5, 9, or 12 V; 1 A Switching power supply provides a constant source of DC voltage and current For powering and testing electronic devices Single output supplies a fixed voltage of 3.3V, 4.5V, 6V, 7.5V, 9V, or 12VDC Accepts input voltage of 120VAC at 60 Hz Can be used in place of a battery