This is a small power supply for powereing a single hard drive or optical drive externally from your computer. it inputs 100 to 240 Volts AC and out puts 5Volts, 1.5Amps, and 12Volts 1.8Amps. It's small size and shape makes this power supply perfect for placing into odd sized enclosures of any kind. This power supply also has a small +/- 5Volt connection for hooking up a small LED to monitor power status.