This is a genuine AC adapter from ACER. It was originally included with an ASPIRE ONE. I used it for the first few years, but it has been stored unused since then. I have confirmed that it powers on and functions correctly. The plug can be rotated 90 degrees, which is quite convenient. - Type: AC Adapter - Input Voltage: 100-240V - Output Voltage: 19V (2.15A 40W) - Plug Type: 2-pin flat plug - Compatible Devices: Laptop PC ※ While the appearance is in relatively good condition, there is some aging, so please understand. ※ The computer is not included. Thank you for looking.