This HP HSTNN-BA18 AC power adapter is a genuine and original product that is compatible with HP laptops. It has a voltage of 19.5V and current of 2.05A, making it a reliable and efficient choice for powering your device. The unit type is a unit and the color is black. This adapter is suitable for the HPSTNN-BA18 model and is a part of the HPSTNN-BA18 product line. It has an output watt of 40W, which is the ideal power needed to charge your laptop. It is compatible with HP laptops and is easy to use.