The Genuine HP 0957-2304 OEM Power Supply AC Adapter 6600 7520 is a black power adapter specifically designed for HP printers, with a maximum output power of 40W. It is compatible with the HP Officejet series and has an output voltage of 12V. This unit is a genuine HP product, ensuring quality and reliability for your printing needs. With a compact design and a weight of 9 oz, this power supply is a convenient and efficient solution for powering your HP printer.