The Insignia 90 W AC Adapter is a universal power adapter designed for use with various brands and models of laptops. With a voltage of 19 V and an output current of 4.74 A, this black adapter is compatible with the Insignia NS-PWLC591 model and is suitable for a range of universal devices. It is important to note that this product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm, as required by state law.