HP 741727-001B Smart AC adapter supplies power to a compatible laptop, with a rated output of 45 W. Its specified output is 19.5 V at 2.31 A, for powering the computer through an AC outlet.
The adapter has a blue-tip connector with a center pin and a 4.5 mm outer, 2.9 mm inner diameter. The listing specifies an included 3-pole power cable with an EU plug. HP's parts documentation describes the matching adapter as Smart, nPFC, RC and nslim.