The HP HSTNN-CA18 19.5V 2.05A 40W Genuine Original AC Power Adapter Charger is a high-quality, black AC/DC adapter specifically designed for HP laptops. This charger is compatible with the HSTNN-CA18 model and provides a reliable power source to keep your device running smoothly. With an output voltage of 19.5V and a current of 2.05A, this genuine HP adapter is a dependable choice for charging your laptop efficiently and safely.