The BK Precision 1680 Fixed Voltage DC Power Supply with Cigar Lighter Output, 13.8V/4A has a regulated output of 13.8V, which is the same voltage as an automotive electrical system when the engine is running and the battery is charging. At this fixed voltage level, the 1680 can provide 4A continuous, 6A peak output current. This output is ideal for powering most automotive accessories removed from the vehicle.