BK Precision 1501 Single-Output, Dual-Voltage, High-Current Battery Eliminator and DC Power Supply, 1.5V/3A or 3V/3A provides a constant source of DC voltage for powering and testing electronic devices. The power supply unit has one output that supplies a fixed voltage of either 1.5 or 3V DC and current up to 3 amp. The output is isolated from the power line, but they share a common ground. The 1501 accepts an input voltage of 115V AC at 60 Hz, and a 0.5-amp fuse helps protect against overload. The unit can be placed horizontally or vertically on a workbench.