The HP 330W Smart AC Adapter (BF7A6AA) is a high-output replacement or spare power supply for HP laptops, mobile workstations and select docks that use HP's 4.5 mm barrel charging connector and need up to 330 W, such as high-performance ZBook-class workstations. Keeping a second adapter at the office or at home saves carrying the heavy brick back and forth. It accepts 90 to 264 V AC at 47 to 63 Hz, so it works on South African mains and abroad, and delivers 19.5 V at up to 25 A with a quoted 89 percent efficiency. Built-in protection covers over-current, over-voltage, overload and short circuits, and LED indicators show power and status. The black adapter measures 200 x 90 x 25.4 mm, weighs about 900 g and contains at least 10 percent post-consumer recycled plastic. In the box: AC adapter, power cord and warranty card. HP standard one-year limited warranty.