This HP HSTNN-CA40 19.5V 2.31A 45W Genuine Original AC Power Adapter Charger is a must-have for anyone who needs to power their HP laptop. It is compatible with the HSTNN-CA40 model and can be used for both laptops and desktops. The black color makes it sleek and stylish and it is a genuine HP product, ensuring that you are getting a quality product. With an output of 2.31 A and voltage of 19.5V, this AC/DC adapter is perfect for keeping your device running smoothly.