The Replacement AC Adapter for HP Laptop PA-1900-18H2 is a high-quality power supply unit designed for Compaq and HP laptops. With a voltage of 19V and an output current of 4.74A, it delivers a maximum power output of 90W, making it suitable for various laptop models in the HP EliteBook product line. The unit is black in color and is a reliable option for providing power to your laptop while on the go. Made in China, this AC adapter ensures compatibility and efficient performance for your computing needs.