The Acer KP.0450H.001 is an external power supply for compatible Acer laptops, including the listed V3-331/371 series. Its 19 V DC, 2.37 A output and 45 W rating identify the power requirements it provides for the laptop.
The adapter accepts 115–240 V AC and has a three-pin C5 input connection. Its black housing and 1.45 m cable are specified in the listing; the cable length gives some flexibility in placing the adapter near the laptop.
The listing describes it for home use and specifies that a mains cable is not included. Check the model reference and output ratings when matching it to an Acer laptop.
Package contents: the mains cable is not included.