B&K Precision 1682A is a 13.8V, 12A DC power supply designed to safely power automotive accessories outside of a vehicle, such as sound systems, cellular phones, and two-way radios. It features a regulated output, overload protection, and a rear-mounted fan for cooling. The unit accepts 115V or 230V AC input power and has a peak output current of 15A. The 1682A is easy to use, with a simple on/off switch and voltage adjustment knob.