This kit is a low-powered DC converter for many car applications, for example, where you need a reliable voltage source for a portable CD player or similar battery-powered device. Another use for this adaptor is for a peripheral computer power supply to power external devices. Just plug its input into your PC's internal power supply cable and get selectable regulated voltage out from 3 to 15VDC. Output current is around 1.5 amps depending on the heatsink used (Not included). * Input voltage MUST be larger than the required output voltage.