http://www.power-ac-adaptor.com/genuine-195v-342a-asus-bu401l-ultrabook-pa165078-ac-adapter-p-1916.html
Genuine 19.5V 3.42A ASUS BU401L Ultrabook PA-1650-78 AC Adapter
Genuine 19.5V 3.42A ASUS BU401L Ultrabook PA-1650-78 AC Adapter

INPUT: 100-240V-nbsp;50-60Hz (for worldwide use)

OUTPUT: 19.5V 3.42A 65W

Connecter size: 4.5 mm3.0 mm,-nbsp;with pin inside(ref to the picture).

Outlet: 3-prong

Cord Cable: US/ UK/ EU/ AU plug

Warranty:12 months